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: Social & Preventive Medicine
[{'content': 'A 28-year-old man comes to the emergency department because of a severe headache, palpitations, excessive sweating, chest pain, visual disturbances, dyspnea. paresthesias, constipation, and a sense of impending doom over the past 2 weeks. These symptoms occur primarily at night. His blood pressure is 130/80 mmHg while supine and 90/60 mmHg while standing; his blood sugar is 240 mg/dL. \nWhich of the following is the most likely diagnosis? \nSelect and explain. \nA. Alcohol withdrawal, B. Familial dysautonomia, C. Opiate withdrawal, D. Pheochromocytoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]