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
The most common organ involved in MEN-1 is: 
Select and explain. 
A. Parathyroid, B. Thyroid, C. Adrenal, D. Testis
A: Parathyroid
Answer: A: Parathyroid 
Explanation: Most common endocrine abnormality ( more than 98% of affected individuals) in MEN1 is multiglandular parathyroid tumours.