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
National Family Health Survey has successfully completed 
Select and explain. 
A. One rounds, B. Two rounds, C. Three rounds, D. Four rounds
C: Three rounds
Answer: C: Three rounds 
Explanation: Is a large-scale, multi-round survey conducted in a representative sample of households throughout India
3 rounds of the survey have been conducted till 2006:
NFHS–1: 1992–93
NFHS–2: 1998–99
NFHS–3: 2005–06