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
Golden period of eye donation ? 
Select and explain. 
A. 6 hours, B. 12 hours, C. 18 hours, D. 24 hours
A: 6 hours
Answer: A: 6 hours 
Explanation: Ans. is 'a' i.e., 6 hours "Donor corneas are harvested from cadaveric donors within 6 hours after death, sometimes up to 12 hours after death in countries with cold climates".