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: Southern Front (Soviet Union) | Statement: [Rostov defensive operations, involves, Southern Front (Soviet Union)]

Target entity: Southern Front (Soviet Union)
Context triple: [Rostov defensive operations, involves, Southern Front (Soviet Union)]

• A. Northern Front (Soviet Union)
  The Northern Front (Soviet Union) was a World War II Red Army formation responsible for defending the northwestern USSR, including the approaches to Leningrad, in the early stages of the German invasion.
• B. Soviet Southern Front chosen
  The Soviet Southern Front was a major Red Army formation on the Eastern Front of World War II, responsible for defending and conducting operations in the southern sector of the Soviet–German front, including in the Donbass region.
• C. Soviet Western Front
  The Soviet Western Front was a major Red Army operational command during the Russian Civil War and Polish–Soviet War, responsible for conducting large-scale offensives against Poland and other western adversaries.
• D. Western Front (Red Army)
  The Western Front (Red Army) was a major Soviet operational-strategic formation responsible for conducting large-scale military operations against German forces on the central sector of the Eastern Front during World War II.
• E. southern Ural front
  The southern Ural front was a key military theater in the Ural region, where Ural Cossack forces were heavily engaged in regional conflicts and border defense operations.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.