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 surgical obturator has to be inserted 
Select and explain. 
A. One day prior to the surgery, B. On the day of the surgery, C. 14 days after the surgery, D. 30 days after the surgery
B: On the day of the surgery
Answer: B: On the day of the surgery 
Explanation: None