This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance abuse, Subject name: Psychiatry
"Chasing the dragon" phenomena occurs with 
Select and explain. 
A. Opioids, B. LSD, C. Cocaine, D. Amphetamine
A: Opioids
Answer: A: Opioids 
Explanation: "Chasing the dragon" refers to inhaling the vapour from a heated solution of morphine, heroin. The "chasing" occurs as the user gingerly keeps the liquid moving in order to keep it from overheating and burning up too quickly, on a heat conducting material such as aluminium foil. The moving smoke is chased after with a tube through which the user inhales. Reference: Kaplon and sadock, 11 th edition, synopsis of psychiatry, 11 th edition, pg no. 659