This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'The most preferred approach for pituitary surgery at the present time is \nSelect and explain. \nA. Transcranial, B. Transethmoidal, C. Transphenoidal, D. Transcallosal', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Most pituitary tumors are approached through the nose by the trans-sphenoidal approach" - Schwaz Ref : Schwaz, 9/e p1541', 'role': 'assistant'}]