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
Disinfection of water is not required if the source is from- 
Select and explain. 
A. Tube well, B. Step well, C. Draw well, D. River
A: Tube well
Answer: A: Tube well 
Explanation: Ans. is 'a' i.e., Tube well