This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
[{'content': 'All are involved in MEN IIA except: \nSelect and explain. \nA. Pituitary, B. Parathyroid, C. Thyroid, D. Adrenal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: a. Pituitary(Ref: Nelson\'s 20/e p 2694-2481, Ghai 8/e p 523)In Multiple Endocrine Neoplasia (MEN) IIA, features seen are: "HAPPY", i.e. Hirschsprung disease, Amyloidosis, Pheochromocytoma, Parathyroid hyperplasia/Adenoma and thyroid Carcinoma (Medullary).', 'role': 'assistant'}]