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
All are organophosphorus poison, except ? 
Select and explain. 
A. Abate, B. Dibenanone, C. Propoxur, D. Malathione
C: Propoxur
Answer: C: Propoxur 
Explanation: Ans. is 'c' i.e., Propoxur