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
[{'content': 'National Family Health Survey has successfully completed:- \nSelect and explain. \nA. One round, B. Two rounds, C. Three rounds, D. Four rounds', 'role': 'user'}, {'content': 'Answer: D \nExplanation: National Family Health Survey (NFHS) is conducted once in every 5-6 years by International institute of population sciences (IIPS), Mumbai. 1st conducted in 1992-93, 2nd 1998-99, 3rd 2005-06, 4th 2015-16. Four rounds of National Family Health Survey have been conducted so far.', 'role': 'assistant'}]