This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Community Ophthalmology, Subject name: Ophthalmology
[{'content': 'Which of the following is not an agency for vision 2020 program \nSelect and explain. \nA. WHO, B. UNESCO, C. ORBIS, D. Sight Savers International', 'role': 'user'}, {'content': 'Answer: B \nExplanation: UNESCO is not a paicipant for vision 2020 program Vision 2020-Right to Sight Initiative', 'role': 'assistant'}]