This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
Mosquito net hole diameter is - 
Select and explain. 
A. 0.02 inch, B. 0.0475 inch, C. 0.5 inch, D. 0.1 inch
B: 0.0475 inch
Answer: B: 0.0475 inch 
Explanation: Personal protection against mosquito bite includes a mosquito net, screening, and repellents. Nets provide protection against bite during sleep. The material of the net should be white, for easy detection of mosquitoes. There should not be a single hole or rent in the net. The size of the opening in the net is of utmost impoance - size should not exceed 0.0475 inches in diameter. The number of holes in one square inch is 150. REFERENCE: PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE, 25TH EDITION, PG NO. 833