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
PH of drinking water 
Select and explain. 
A. 4.5 - 6, B. 6.5 - 8.5, C. 7.5 - 9, D. 9.5
B: 6.5 - 8.5
Answer: B: 6.5 - 8.5 
Explanation: None