This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Medicine
Pheochromocytoma produces all except? 
Select and explain. 
A. Nor-epinephrine, B. Secretin, C. Vaso-active intestinal polypeptide, D. Calcitonin
B: Secretin
Answer: B: Secretin 
Explanation: Pheochromocytoma secrets Norepinephrine VIP- Secretory diarrhea in pheochromocytoma is due to VIP, VIP opens water channels which result in development of secretory Diarrhea Calcitonin- Pheochromocytoma associated with MEN 2a syndrome MEN 2a - Medullary carcinoma of the thyroid(calcitonin), pheochromocytoma, parathyroid hyperplasia