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': 'Under the registration Act of 1969, Birth should be registered within - \nSelect and explain. \nA. 7 days after birth, B. 20 days after birth, C. 14 days after birth, D. 21 days after birth', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]