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': 'All of the following are founding members of vision 2020 except - \nSelect and explain. \nA. WHO, B. UNICEF, C. ORBIS, D. International Agency For Prevention Blindness', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., UNICEF", 'role': 'assistant'}]