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
Least toxic organiophosphorus compound is : 
Select and explain. 
A. DDT, B. Paris green, C. Malathion, D. Parathion
C: Malathion
Answer: C: Malathion 
Explanation: None