This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
Smack otherwise known as 
Select and explain. 
A. Heroin, B. Cocaine, C. Cannabis, D. LSD
A: Heroin
Answer: A: Heroin 
Explanation: Heroin : Smack, Junk, Brown Sugar, Tar Heroin + cocaine: Speed Ball Amphetamine: Superman's Drug, Speed Crystal MDMA: Ecstasy, Rave Drug, Club Drug, Hug drug MDMA + marijuana:Love boat LSD: Battery Acid, Golden Dragon, Heavenly Blue, Hippie Ketamine; Super K, Purple Drug Morphine: Miss Emma, God's Machine This is known as "Chasing the dragon" method used in heroin.