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: Radiology
[{'content': "'Murphy sign' is associated with: March 2004 \nSelect and explain. \nA. Acute cholecystitis, B. Pancreatic mass, C. Splenomegaly, D. Carcinoma colon", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Acute cholecystitis', 'role': 'assistant'}]