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
Relative humidity is determined by 
Select and explain. 
A. Kata thermometer, B. Anemometer, C. Sling psychrometer, D. Gardbad apparatus
C: Sling psychrometer
Answer: C: Sling psychrometer 
Explanation: None