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: Pathology
[{'content': 'Most common site for carcinoma of pancreas ? \nSelect and explain. \nA. Head, B. Ampulla, C. Body, D. Tail', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Head Pancreatic carcinoma o Pancreatic carcinoma is the most common malignant tumor of pancrease. Risk factors Smoking --> Most consistent risk factor. o Obesity o High fat, low fibre diet. o Chronic pancreatitis o Diabetes Pathology o Pancreatic carcinoma are ductal adenocarcinomas. o Most common site is head of pancrease. The distribution is as follows. o Head (70%) o Body (20%) o Tail (10%)", 'role': 'assistant'}]