This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
Which is not a derivative of cannabis? 
Select and explain. 
A. Heroin, B. Charas, C. Ganza, D. Bhang
A: Heroin
Answer: A: Heroin 
Explanation: Ans. (a) HeroinRef.: Parikh 6th ed. 10.54