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: Social & Preventive Medicine
[{'content': 'Category-1 visual impairment is ? \nSelect and explain. \nA. Mild visual impairment, B. Moderate visual impairment, C. Severe visual impairment, D. Blind eye', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Moderate visual impairment", 'role': 'assistant'}]