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': 'Commonest symptom of pheochromocytoma is \nSelect and explain. \nA. Palpitation, B. Headache, C. Sweating, D. Dyspnoea', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Headache Hypeension is the most common symptom of pheochromocytoma followed by headache > Sweating > Palpitation.", 'role': 'assistant'}]