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
Which of the following is the most preferred approach for pituitary surgery at the present time? 
Select and explain. 
A. Transcranial, B. Transcallosal, C. Transethmoidal, D. Transsphenoidal
D: Transsphenoidal
Answer: D: Transsphenoidal 
Explanation: Transsphenoidal approach through the nose is the most preferred approach for pituitary surgeries. Craniotomy is needed for resection of large tumors. Ref: Bailey and Love Sho Practice of Surgery, 25th Edition, Page 634.