This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parathyroid and adrenal glands, Subject name: Surgery
[{'content': 'Commonest symptom of pheochromocytoma is: \nSelect and explain. \nA. Palpitation, B. Headache, C. Sweating, D. Dyspnea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Classic triad: Headache, Diaphoresis, Palpitations. Most common symptom is headache. MC manifestation is Hypeension.', 'role': 'assistant'}]