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 nucleus and Cortex are Respectively \nSelect and explain. \nA. 1.42 , 1.30, B. 1.39 , 1.42, C. 1.42 , 1.39, D. 1.30 , 1.42', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Refractive index of nucleus and Cortex are Respectively are 1.42 and 1.39.', 'role': 'assistant'}]