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': 'Refractive index of vitreous humor ? \nSelect and explain. \nA. 1, B. 30-Jan, C. 14, D. 1.336', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 1.336", 'role': 'assistant'}]