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': 'World Anti-Tobacco day \nSelect and explain. \nA. 31st May, B. 1-Dec, C. 7th April, D. 29th September', 'role': 'user'}, {'content': 'Answer: A \nExplanation: World health day - 7th April.\nWorld AIDS day - 1 December.\nWorld Anti-Tobacco day - 31st May.\nWorld Heart day - 29th September.\nWorld Anaesthesia day - 16 October.\nNational Epilepsy day - 17th November.', 'role': 'assistant'}]