This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Census, SRS, NFHS, DLHS, VRS, Subject name: Social & Preventive Medicine
Sample Registration System, True is:- 
Select and explain. 
A. It is the only dual record data collection system, B. It has completed 4 rounds, C. Once undeaken every 5 - 6 years, D. It mandates bih, death and marriage registration
A: It is the only dual record data collection system
Answer: A: It is the only dual record data collection system 
Explanation: Sample Registration System;- SRS most accurate as it is the only dual record data collection system. Here we measure IMR, MMR, U-5MR, NMR, Growth rate It is conducted once every 6 months. NFHS :- Conducted by IIPS, Mumbai It has completed 4 rounds Once undeaken every 5 - 6 years DLHS :- This is used for MCH indicators Focuses routine assessment of regular immunization coverage levels district wise in India Undeaken once every 4-5 years Round completed -4 rounds.