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: Microbiology
ULPA filters are used to disinfect 
Select and explain. 
A. Water, B. Air, C. Urine, D. Blood
B: Air
Answer: B: Air 
Explanation: ULPA (Ultra - low Particulate / penetration air filters)