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': 'Which of the following is the most common site for the carcinoma of pancreas - \nSelect and explain. \nA. Head, B. Ampulla, C. Body, D. Tail', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common site for carcinoma pancreas is head. The distribution as follows:\n\nHead (75%)\xa0\nBody (15%)\xa0\nTail (10%)\n\nDuctal adenocarcinoma is the most common variety (90%)\nAlso know,\nRisk factors for pancreatic Ca\n\nCigarette smoking is the most consistent risk factor.\nAs in other gastrointestinal cancers, diets high in fat and low in fibre, fruits and vegetables are thought to be associated with an increased risk.\n\nOther risk factors are :\nChronic pancreatitis\nDiabetes\nObesity\nAlcohol abuse or cholelithiasis are not risk factors for pancreatic cancer.', 'role': 'assistant'}]