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': 'Investigation to diagnose carcinoma head of pancrease are/is -a) Hypotonic duodenogramb) X-ray abdomenc) USGd) Endoscopye) C.T. Scan \nSelect and explain. \nA. bce, B. acde, C. abcd, D. abde', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Investigations done in pancreatic cancer\n\n\n\u200bUSG\nCT scan\nERCP\nEndoscopic U/S\nAngiography\nBarium studies - barium meal & hypotonic duodenography\nContrast enhanced CT scan is the inv. of choice.', 'role': 'assistant'}]