This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'All of the following is true regarding blindness except - \nSelect and explain. \nA. There is estimated 45 million people blind world-wide, B. 20% of cases blindness in India is due to cataract, C. Most common cause of blindness in India is cataract, D. Visual acuity less than 3/60 is blindness', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *62.6% cases blindness in India is due to cataract *19.7% due to refractive error. Ref- Park&;s textbook of Preventive and social medicine 23rd edition.', 'role': 'assistant'}]