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
A patient has hypocalcaemia which was the result of a surgical complication. Which operation could it possibly have been - 
Select and explain. 
A. Nephrectomy, B. Thyroidectomy, C. Gastrectomy, D. Vocal cord tumour biopsy
B: Thyroidectomy
Answer: B: Thyroidectomy 
Explanation: None