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: Pathology
Which of the following is not involved in MEN II syndrome ? 
Select and explain. 
A. Pituitary tumor, B. Medullary carcinoma of thyroid, C. Pheochromocytoma, D. Parathyroid adenoma
A: Pituitary tumor
Answer: A: Pituitary tumor 
Explanation: Ans. is 'a' i.e., Pitutary tumor