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
Criteria for drinking water quality recommended by WHO includes - 
Select and explain. 
A. Colour < 15 TCU, B. pH 6.5-8.5, C. Chloride 200-600 mg/1, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., Colour < 15 TCU; 'b' i.e., pH 6.5-8.5; 'c' i.e., Chloride 200-600 mg/l