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
EIKJMAN'S test used in 
Select and explain. 
A. As coliform test, B. To determine chlorine demond, C. Air quality test, D. Humidity test
D: Humidity test
Answer: D: Humidity test 
Explanation: None