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
[{'content': 'Which of the following is not involved in MEN II syndrome ? \nSelect and explain. \nA. Pituitary tumor, B. Medullary carcinoma of thyroid, C. Pheochromocytoma, D. Parathyroid adenoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Pitutary tumor", 'role': 'assistant'}]