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
True about pheochromocytoma is 
Select and explain. 
A. 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
A: Arises from chromaffin cells of adrenal medulla
Answer: A: Arises from chromaffin cells of adrenal medulla 
Explanation: 10% are bilateral 10% are malignant 10% occur in pediatric patients 10% are extra-adrenal 10% are familial