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 one of the following is a DUAL RECORD SYSTEM consisting of continuous enumeration of birth and death by numerator and which indicates survey every six months? 
Select and explain. 
A. Census, B. Civil registration system, C. Sample registration system, D. Model registration system
C: Sample registration system
Answer: C: Sample registration system 
Explanation: None