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: Medicine
The most common cause of hypoparathyroidism is: 
Select and explain. 
A. Idiopathic, B. Familial, C. Postradiation, D. Surgical removal
D: Surgical removal
Answer: D: Surgical removal 
Explanation: Surgical removal of the gland is the most common cause for hypoparathyroidism.