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': 'Because of circle of least diffusion, the distant vision is comparatively good in: \nSelect and explain. \nA. Simple myopic astigmatism, B. Compound myopic astigmatism, C. Mixed astigmatism, D. Compound hypermetropic astigmatism', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Mixed astigmatism', 'role': 'assistant'}]