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
The characteristic burnt rope odour is caused by toxin of: 
Select and explain. 
A. Cannabis, B. Tobacco, C. Strychnine, D. Chloral hydrate
A: Cannabis
Answer: A: Cannabis 
Explanation: Ans. a. Cannabis