This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Social & Preventive Medicine
Sample registration is done 
Select and explain. 
A. Every 3 months, B. Every 6 months, C. Every 9 months, D. Every 12 months
B: Every 6 months
Answer: B: Every 6 months 
Explanation: Sample registration system (SRS) SRS is taken once every 6 months It is a dual record data collection system of India Therefore, it is the most accurate data collection system of India