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
Number of holes in mosquito net (per sq. inch)- 
Select and explain. 
A. 50, B. 150, C. 100, D. 200
B: 150
Answer: B: 150 
Explanation: Ans. is 'b' i.e., 150 Mosquito net It offers protection against mostquito bite during sleep. The best pattern is the rectangular net. The size of the openings in the net is of utmost impoance, the size should not exceed 0.0475 inch in any diameter. The number of holes in one square inch is usually 150.