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
Venturi meter is used for- 
Select and explain. 
A. Measuring amount required for chlorination, B. Measuring air velocity, C. Measuring bed strength in slow sand filter, D. Measuring dissolving capacity of gas
C: Measuring bed strength in slow sand filter
Answer: C: Measuring bed strength in slow sand filter 
Explanation: Ans. is 'c' i.e., Measuring bed strength in slow sand filter