This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'A 40 year old male presents with a painless cystic liver enlargement of four years duration without fever or jaundice. The most likely diagnosis is - \nSelect and explain. \nA. Amoebic liver abscess, B. Hepatoma, C. Hydatid cyst of liver, D. Choledochal cyst', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]