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
A chloride level of--is said to be acceptable by WHO: 
Select and explain. 
A. 0.2 mg/L, B. 0.5 mg/L, C. 45 mg/L, D. 200 mg/L
D: 200 mg/L
Answer: D: 200 mg/L 
Explanation: 200 mg/L