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': "45 year old patient presents with acute cholecystitis. Blood investigation showed raised bilirubin. His pain resolved over the period but raised Bilirubin persisted. ERCP showed cholecystocholedochal fistula. What is the  probable diagnosis \nSelect and explain. \nA. Mirizzi syndrome, B. Cholangitis, C. Caroli's disease, D. Hepatic fibrosis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mirizzi syndrome is obstructive jaundice caused usually due to cholecystocholedochal fistula.', 'role': 'assistant'}]