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': 'For transplantation. cornea is preserved in: \nSelect and explain. \nA. Modified MK medium, B. Glycerine medium, C. Wet medium, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Modified MK medium', 'role': 'assistant'}]