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: Medicine
10% Tumour is 
Select and explain. 
A. Pheochromocytoma, B. Papillary Thyroid Carcinoma, C. Follicular Thyroid Carcinoma, D. Brown’s Tumor
A: Pheochromocytoma
Answer: A: Pheochromocytoma 
Explanation: Pheochromocytomas normally obey the “rule of 10”. Hence, they are also called the “10% tumor”. i.e. 10% of pheochromocytomas are: 

Familial. 
Malignant. 
Bilateral. 
Extra-adrenal. 
Seen in children