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': 'Total number of refractive surfaces in the Eye is \nSelect and explain. \nA. 2, B. 4, C. 5, D. 3', 'role': 'user'}, {'content': 'Answer: B \nExplanation: There are 4 refractive surfaces in the Eye\n\nAnterior surface of Cornea\nPosterior surface of Cornea\nAnterior surface of Lens\nPosterior surface of Lens', 'role': 'assistant'}]