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': 'The eye condition for which the World bank assistance was provided to the National Programme for Control of Blindness: March 2013 \nSelect and explain. \nA. Onchocerciaisis, B. Cataract, C. Trachoma, D. Vitamin A deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Cataract', 'role': 'assistant'}]