This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
Tumor that follows rule of 10 is 
Select and explain. 
A. pheochromocytoma, B. Onocytoma, C. Lymphoma, D. Renal cell carcinoma
A: pheochromocytoma
Answer: A: pheochromocytoma 
Explanation: Pheochromocytomas are neoplasms composed of chromaffin cells. They follow rule of 10: - 10% of pheochromocytomas are extra adrenal - 10% of sporadic adrenal pheochromocytomas are bilateral - 10% of adrenal pheochromocytomas are biologically malignant. -10% of adrenal pheochromocytomas are not associated with hypeension. Ref: Robbins and cotrans 9e