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
[{'content': 'Resuscitation time of the human retina following ischaemia is: \nSelect and explain. \nA. 30 minutes, B. 45 minutes, C. 1 to 2 hours, D. 15 to 20 minutes', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. 1 to 2 hours', 'role': 'assistant'}]