This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'Bih and death registration act came into force on 1st april,------ \nSelect and explain. \nA. 1968, B. 1969, C. 1970, D. 1971', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amendments of the Registration of Bihs and Deaths Act, 1969 - PIB Sections of the act', 'role': 'assistant'}]