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': 'The characteristic burnt rope odour is caused by toxin of: \nSelect and explain. \nA. Cannabis, B. Tobacco, C. Strychnine, D. Chloral hydrate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Cannabis', 'role': 'assistant'}]