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': 'Health for all by the World Health Organization was announced at- \nSelect and explain. \nA. USA, B. USSR, C. Canada, D. Geneva', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]