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': 'A patient presented with headache and flushing. He has a family history of his relative having died of a thyroid tumour. The investigation that would be required for this patient would be - \nSelect and explain. \nA. Chest X-ray, B. Measurement of 5 HIAA, C. Measurement of catecholamine, D. Intravenous pyelography', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans is "C" i.e. measurement of catecholamine This patient is having MEN syndrome more specifically MEN type 2, which includes. Medullary carcinoma of thyroid and Pheochromocytoma Headache and flushing are manifestation of pheochromocytoma which can be diagnosed by measuring catecholamine level in urine or blood.', 'role': 'assistant'}]