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
Resuscitation time of the human retina following ischaemia is: 
Select and explain. 
A. 30 minutes, B. 45 minutes, C. 1 to 2 hours, D. 15 to 20 minutes
C: 1 to 2 hours
Answer: C: 1 to 2 hours 
Explanation: Ans. 1 to 2 hours