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
Which of the following condition is associated with elevated vanillyl mandelic acid (VMA) in urine ? 
Select and explain. 
A. Cushing's syndrome, B. Pheochromocytoma, C. Carcinoid, D. Addison's disease
B: Pheochromocytoma
Answer: B: Pheochromocytoma 
Explanation: Vanillyl mandelic acid (VMA) is an end-stage metabolite of the catecholamines epinephrine and norepinephrine. It is produced intermediary metabolites. Urinary VMA is elevated in patients with tumors that secrete catecholamines. These urinalysis tests are used to diagnose an adrenal gland tumor called pheochromocytoma, a tumor of catecholamine-secreting chromaffin cells. These tests may also be used to diagnose neuroblastomas, and to monitor treatment of these conditions.