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 Song dynasty | Statement: [Mongol–Song War, belligerent, Southern Song dynasty]

Target entity: Southern Song dynasty
Context triple: [Mongol–Song War, belligerent, Southern Song dynasty]

• A. Song dynasty
  The Song dynasty was a major Chinese imperial dynasty (960–1279) known for its economic prosperity, urbanization, technological innovation, and flourishing arts and culture.
• B. Southern Tang
  Southern Tang was a prominent kingdom in southern China during the Five Dynasties and Ten Kingdoms period, noted for its relative cultural flourishing and patronage of the arts.
• C. Southern Qi dynasty
  The Southern Qi dynasty was a short-lived Chinese imperial dynasty (479–502 CE) of the Southern Dynasties period, known for its rule over southeastern China from its capital at Jiankang and for relative political instability despite cultural continuity.
• D. Eastern Jin dynasty
  The Eastern Jin dynasty was a Chinese imperial dynasty (317–420 CE) that ruled southern China from its capital at Jiankang after the fall of the Western Jin.
• E. Yuan dynasty
  The Yuan dynasty was a Chinese imperial dynasty established by the Mongol leader Kublai Khan that ruled China as part of the vast Mongol Empire in the 13th and 14th centuries.
• 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: Southern Song dynasty
Triple: [Mongol–Song War, belligerent, Southern Song dynasty]

The Southern Song dynasty was the Chinese imperial regime that ruled the south of China from 1127 to 1279, overseeing a flourishing of commerce, urban culture, and the arts before ultimately falling to the Mongol-led Yuan dynasty.

Target entity: Southern Song dynasty
Target entity description: The Southern Song dynasty was the Chinese imperial regime that ruled the south of China from 1127 to 1279, overseeing a flourishing of commerce, urban culture, and the arts before ultimately falling to the Mongol-led Yuan dynasty.

• A. Song dynasty chosen
  The Song dynasty was a major Chinese imperial dynasty (960–1279) known for its economic prosperity, urbanization, technological innovation, and flourishing arts and culture.
• B. Southern Tang
  Southern Tang was a prominent kingdom in southern China during the Five Dynasties and Ten Kingdoms period, noted for its relative cultural flourishing and patronage of the arts.
• C. Southern Qi dynasty
  The Southern Qi dynasty was a short-lived Chinese imperial dynasty (479–502 CE) of the Southern Dynasties period, known for its rule over southeastern China from its capital at Jiankang and for relative political instability despite cultural continuity.
• D. Eastern Jin dynasty
  The Eastern Jin dynasty was a Chinese imperial dynasty (317–420 CE) that ruled southern China from its capital at Jiankang after the fall of the Western Jin.
• E. Yuan dynasty
  The Yuan dynasty was a Chinese imperial dynasty established by the Mongol leader Kublai Khan that ruled China as part of the vast Mongol Empire in the 13th and 14th centuries.
• F. None of above.