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
[{'content': 'Cholinesterase reactivators are ineffective in case of: DNB 08, 10 \nSelect and explain. \nA. Baygon, B. Parathion, C. Malathion, D. Tik 20', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Baygon', 'role': 'assistant'}]