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: Surgery
The most common cause of hypoparathyroidism after thyroidectomy is: 
Select and explain. 
A. Removal, B. Vascular injury, C. Hypertrophy, D. Malignancy
B: Vascular injury
Answer: B: Vascular injury 
Explanation: None