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: Pathology
[{'content': 'In pheochromocytoma, not a pa the rule of 10 is \nSelect and explain. \nA. 10% are bilateral, B. 10% are malignant, C. 10% are extra adrenal, D. 10% are symptomatic', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans is \'d\' i.e. 10% are symptomatic Pheochromocytomas usually subscribe to a convenient "rule of 10" or "10% tumor"; i.e. 10% of pheochromocytomas are :-Bilateral Extra-adrenal FamilialMalignant Multiple Occur in children', 'role': 'assistant'}]