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: Psychiatry
“Smack” is the “common” name for 
Select and explain. 
A. Heroin, B. Cocaine, C. Opium, D. None
A: Heroin
Answer: A: Heroin 
Explanation: Heroin or di-acetyl-morphine is about two times more potent than morphine in injectable form. Apart from the parenteral mode of administration,
heroin can also be smoked or ‘chased’ ( chasing the dragon), often in an impure form (called ‘ smack’ or ‘ brown sugar’ in India). 
Heroin is more addicting than morphine and can cause dependence even after a short period of exposure.