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: Dental
[{'content': 'World health day is on \nSelect and explain. \nA. 14th April, B. 14th March, C. 7th March, D. 7th April', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]