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': 'Ramu, presents with recurrent attacks of cholelithiasis, U/S examination shows a dilated CBD of 1 cm. The next line of management is ? \nSelect and explain. \nA. ERCP, B. PTC, C. Cholecystostomy, D. Intravenous cholangiogram', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is A ie. ERCP The first inv. for any pt. with cholelithiasis or jaundice is U/S. Next inv. depends on U/S findings, If the intrahepatic ducts are dilated without any extrahepatic dilatation then the preferred inv. is ----> PTC* If the dilatation is in CBD ---> ERCP*. ERCP may provide direct diagnosis of the distal CBD pathology and may be therapeutic as well for a CBD stone or stricture.', 'role': 'assistant'}]