This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 1, Subject name: Forensic Medicine
The WHO permissible limit of arsenic in drinking water is:- 
Select and explain. 
A. 0.01 mg/L, B. 0.001 mg/L, C. 0.01 microgram/L, D. 0.1 mg/L
A: 0.01 mg/L
Answer: A: 0.01 mg/L 
Explanation: WHO permissible limit of arsenic content in drinking water is 0.01 mg/L