Drugs obtained from opium bind to specific receptors present in our $CNS$. Heroin,commonly called smack,is chemically $..........$,which is a white,odorless,bitter,crystalline compound. This is obtained by $..........$ of morphine.

• A
  diacetylmorphine,methylation
• B
  diacetylmorphine,acetylation
• C
  benzodiazepines,amination
• D
  amphetamines,acetylation