Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Calixtus III (antipope) | Statement: [Paschal III, successor, Calixtus III (antipope)]

Target entity: Calixtus III (antipope)
Context triple: [Paschal III, successor, Calixtus III (antipope)]

• A. Antipope Felix II
  Antipope Felix II was a 4th-century cleric installed in opposition to Pope Liberius during the Arian controversy, later regarded by the Catholic Church as an illegitimate pope.
• B. John XXIII (antipope)
  John XXIII (antipope) was a rival claimant to the papacy during the Western Schism, recognized by the Pisan obedience but later deposed by the Council of Constance.
• C. Clement VII (Avignon antipope)
  Clement VII (Avignon antipope) was a 14th-century French cardinal who became the first major Avignon claimant to the papacy during the Western Schism, opposing the Roman popes and deepening the split within the Catholic Church.
• D. Antipope Victor IV
  Antipope Victor IV was a 12th-century claimant to the papacy, backed by Holy Roman Emperor Frederick I Barbarossa in opposition to the legitimate Pope Alexander III during a major schism in the Catholic Church.
• E. antipope Felix V
  Antipope Felix V was the last historical antipope, a 15th-century Duke of Savoy who was elected by the Council of Basel in opposition to Pope Eugene IV.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Calixtus III (antipope)
Triple: [Paschal III, successor, Calixtus III (antipope)]

Calixtus III was a 12th-century antipope who opposed the legitimate papacy during the schism surrounding Emperor Frederick I Barbarossa’s conflicts with the Church.

Target entity: Calixtus III (antipope)
Target entity description: Calixtus III was a 12th-century antipope who opposed the legitimate papacy during the schism surrounding Emperor Frederick I Barbarossa’s conflicts with the Church.

• A. Antipope Felix II
  Antipope Felix II was a 4th-century cleric installed in opposition to Pope Liberius during the Arian controversy, later regarded by the Catholic Church as an illegitimate pope.
• B. John XXIII (antipope)
  John XXIII (antipope) was a rival claimant to the papacy during the Western Schism, recognized by the Pisan obedience but later deposed by the Council of Constance.
• C. Clement VII (Avignon antipope)
  Clement VII (Avignon antipope) was a 14th-century French cardinal who became the first major Avignon claimant to the papacy during the Western Schism, opposing the Roman popes and deepening the split within the Catholic Church.
• D. Antipope Victor IV chosen
  Antipope Victor IV was a 12th-century claimant to the papacy, backed by Holy Roman Emperor Frederick I Barbarossa in opposition to the legitimate Pope Alexander III during a major schism in the Catholic Church.
• E. antipope Felix V
  Antipope Felix V was the last historical antipope, a 15th-century Duke of Savoy who was elected by the Council of Basel in opposition to Pope Eugene IV.
• F. None of above.