This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Social & Preventive Medicine
n95 mask is used for; 
Select and explain. 
A. respiratory droplets, B. aerosol, C. in general, D. Dust
A: respiratory droplets
Answer: A: respiratory droplets 
Explanation: An N95 respirator is a respiratory protective device designed to achieve a very efficient filtration of airborne paicles. The 'N95' designation means that when subjected to careful testing, the respirator blocks at least 95 percent of very small (0.3 micron) test paicles. If properly fitted, the filtration capabilities of N95 respirators exceed those of face masks.