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': 'Birth and death registration should be done within how many days? \nSelect and explain. \nA. 21 and 21 respectively, B. 7 and 14 respectively, C. 7 and 21 respectively, D. 14 and 7 respectively', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]