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: Forensic Medicine
Cholinesterase reactivators are ineffective in case of: DNB 08, 10 
Select and explain. 
A. Baygon, B. Parathion, C. Malathion, D. Tik 20
A: Baygon
Answer: A: Baygon 
Explanation: Ans. Baygon