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: Radiology
Which of the following cranial nerve can be visualised on plain CT scan? 
Select and explain. 
A. Optic, B. Trigeminal, C. Facial, D. Hypoglossal
A: Optic
Answer: A: Optic 
Explanation: Ans. Optic