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: Unknown
In pheochromocytoma, not a part the rule of 10 is? 
Select and explain. 
A. 10% are bilateral, B. 10% are malignant, C. 10% are extra-adrenal, D. 10% are symptomatic
D: 10% are symptomatic
Answer: D: 10% are symptomatic 
Explanation: Ans is 'd' i.e. 10% are symptomatic o Pheochromocytomas usually subscribe to a convenient "rule of 10" or "10% tumor"; i.e. 10% of pheochromocytomas are :-1) Bilateral2) Extra-adrenal3) Familial4) Malignant5) Multiple6) Occur in children