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: Alexander V (antipope) | Statement: [John XXIII (antipope), predecessor, Alexander V (antipope)]

Target entity: Alexander V (antipope)
Context triple: [John XXIII (antipope), predecessor, Alexander V (antipope)]

• A. 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.
• B. 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.
• C. 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.
• D. Antipope Anacletus II
  Antipope Anacletus II was a 12th-century Roman nobleman who, in a major schism, claimed the papacy in opposition to Pope Innocent II and was backed by powerful Italian factions.
• E. 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.
• 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: Alexander V (antipope)
Triple: [John XXIII (antipope), predecessor, Alexander V (antipope)]

Alexander V was a 15th-century antipope elected at the Council of Pisa during the Western Schism in an attempt to end the papal split between Rome and Avignon.

Target entity: Alexander V (antipope)
Target entity description: Alexander V was a 15th-century antipope elected at the Council of Pisa during the Western Schism in an attempt to end the papal split between Rome and Avignon.

• A. 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.
• B. 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.
• C. 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.
• D. Antipope Anacletus II
  Antipope Anacletus II was a 12th-century Roman nobleman who, in a major schism, claimed the papacy in opposition to Pope Innocent II and was backed by powerful Italian factions.
• E. 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.
• F. None of above. chosen