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: Pediatrics
Which of the following does not belong to Wermer's syndrome? 
Select and explain. 
A. Pheochromocytoma, B. Parathyroid hyperplasia, C. Prolactinoma, D. Pancreatic hyperplasia
A: Pheochromocytoma
Answer: A: Pheochromocytoma 
Explanation: MEN 1 / Wermer's syndrome :

Parathyroid hyperplasia / adenoma.
Pitutary hyperplasia - Prolactinoma.
Pancreatic hyperplasia - Gastrinoma > Insulinoma > Glucagonoma.