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
In which system, continuous enumeration of births 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: None