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': 'Which is the commonest cause of occular morbidity in the community - \nSelect and explain. \nA. Cataract, B. Refractive error, C. Occular injury, D. Vitamin A deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common cause of blindness in India is cataract.\nSecond most common cause of blindness in India is refractive errors.\nMost common cause of low vision is refractive errors.\nAnd, refractive errors cause low vision in 100% of cases.\nSo, refractive errors should be the most common cause of ocular morbidity in India.', 'role': 'assistant'}]