This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
Smack is 
Select and explain. 
A. LSD, B. Cocaine, C. Cannabis, D. Heroin
D: Heroin
Answer: D: Heroin 
Explanation: Smack is synthetic opioid Ref : Krishnan vij Textbook of Forensic medicine and Toxicology 5th edtion ; pg no - 492