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
Most common DRUG causing dependence? 
Select and explain. 
A. Cannabis, B. Cocaine, C. Heroin, D. Amphetamine
A: Cannabis
Answer: A: Cannabis 
Explanation: ANS - A.Cannabis Cannabis- 9 million users,192 million users(Acc. To WHO Drug repo 2018)Heroin (opioid derivative) -2.5 lakh usersIt is estimated that 275 million people used illicit drugs, such as cannabis, amphetamines, opioids, and cocaine, in 2016 which translates into an annual prevalence of illicit drug use of 5.6%. Cannabis is most used with 192 million users. Some 31 million people who use drugs suffer from drug use disorders.-(WHO Drug repo 2018)