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
Most sentitive investigation of pancreatic carcinoma is 
Select and explain. 
A. Angiography, B. ERCP, C. Ultrasound, D. CT scan
B: ERCP
Answer: B: ERCP 
Explanation: Ans. is 'b' i.e., ERCP ERCP is the most sensitive test for detecting pancreatic cancer but CT scan is the inv. of choice. Schwaz writes - "Currently CT is probably the single most versatile and cost effective tool for the diagnosis of pancreatic cancer." CSDT writes - "In patients with a typical clinical history and a pancreatic mass on CT, ERCP is unnecessary. In the absence of a mass, an ERCP is indicated. It is the most sensitive test (95%) for detecting pancreatic cancer though specificity in differentiation between cancer and pancreatitis is low."