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': 'Estimation of plasma cholinesterase levels may be helpful in the management of poisoning with: UPSC 07 \nSelect and explain. \nA. Dhatura, B. Barbiturate, C. Organophosphorus, D. Opium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Organophosphorus', 'role': 'assistant'}]