This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parathyroid and adrenal glands, Subject name: Surgery
[{'content': 'The most common organ involved in MEN-1 is: \nSelect and explain. \nA. Parathyroid, B. Thyroid, C. Adrenal, D. Testis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common endocrine abnormality ( more than 98% of affected individuals) in MEN1 is multiglandular parathyroid tumours.', 'role': 'assistant'}]