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': 'Definition of Blindness when visual acuity is less than ___________ in better eye according to NPCB and WHO respectively \nSelect and explain. \nA. < 3/60 and < 6/18, B. < 6/18 and < 3/60, C. < 3/60 and < 3/60, D. < 6/18 and < 6/18', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]