This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health care of community & international health, Subject name: Social & Preventive Medicine
[{'content': 'World health day - \nSelect and explain. \nA. 7th April, B. 7th July, C. 7th Dec, D. 7th Feb', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The constitution came into force on 7 th April 1948 which is celebrated every year as "world health Day ".A world health day theme is chosen each year to focus attention on a specific aspect of public health (refer pgno:919 park 23rd edition)', 'role': 'assistant'}]