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: Ophthalmology
True about Optic disc : 
Select and explain. 
A. Horizontal diameter 1.76 mm, B. Veical diameter 1.88 m, C. Contain 1 million nerve fibre, D. All
C: Contain 1 million nerve fibre
Answer: C: Contain 1 million nerve fibre 
Explanation: C i.e. Contain 1 million nerve fibre