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
Category-1 visual impairment is ? 
Select and explain. 
A. Mild visual impairment, B. Moderate visual impairment, C. Severe visual impairment, D. Blind eye
B: Moderate visual impairment
Answer: B: Moderate visual impairment 
Explanation: Ans. is 'b' i.e., Moderate visual impairment