This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
National Family Health Survey is done every 
Select and explain. 
A. 6 months, B. 1 year, C. 5 years, D. 10 years
B: 1 year
Answer: B: 1 year 
Explanation: National family health survey is conducted during every 1 year Reference: Park&;s textbook of preventive and social medicine, 23rd edition