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
Which of the following is/are source of moality related data: 
Select and explain. 
A. Sample registration system, B. Death ceificate, C. Central bihs & deaths registration act, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans: d. All of the above The SRS is a dual-record system, consisting of continuous enumeration of bihs & deaths by an enumerator & an independent survey every 6 months by an investigator-supervisorSince the introduction of this system, more reliable information on bih & death rates, age-specific feility & moality rates, infant, under-five & adult moality etc. have become available.The act came into force on 1 april 1970, The act provides for compulsory registration of bihs & deaths throughout the countryThe time limit for registering the event of bihs & that of deaths is 21 days uniformly allover India