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': 'The commonest cause of acute pancreatitis is ? \nSelect and explain. \nA. Biliary calculi, B. Alcohol abuse, C. Infective, D. Idiopathic', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Biliary calculi", 'role': 'assistant'}]