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
Cherry red spot on retina is seen in A/E 
Select and explain. 
A. CRAO, B. CRVO, C. Nieman-pick diseases, D. Tay-sach's disease
B: CRVO
Answer: B: CRVO 
Explanation: B i.e. CRVO