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
Functional assessment of optic nerve is by: 
Select and explain. 
A. Angiography, B. Fundoscopy, C. Perimetry, D. CT Scan
C: Perimetry
Answer: C: Perimetry 
Explanation: Ans. Perimetry