This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
In which system, continous enumeration of bihs and deaths by enumerator and an independent survey by investigator supervisor is done? 
Select and explain. 
A. Decadal Census Enumeration, B. Sample registration system, C. Model registration system, D. National family health survey
B: Sample registration system
Answer: B: Sample registration system 
Explanation: .