This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'True about pheochromocytoma is \nSelect and explain. \nA. Arises from chromaffin cells of adrenal medulla, B. Bilateral in 20% of all cases, C. Hypotension rules out pheochromocytoma, D. Almost always a malignant tumor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 10% are bilateral 10% are malignant 10% occur in pediatric patients 10% are extra-adrenal 10% are familial', 'role': 'assistant'}]