Identify the molecules $(a)$ and $(b)$ shown below and select the right option giving their source and use:

• A
  $(a)$ Molecules $\rightarrow$ Cocaine,Source $\rightarrow$ Erythroxylum coca,Use $\rightarrow$ Accelerates the transport of dopamine
• B
  $(b)$ Molecules $\rightarrow$ Heroine,Source $\rightarrow$ Cannabis sativa,Use $\rightarrow$ Depressant and slows down body functions
• C
  $(b)$ Molecules $\rightarrow$ Cannabinoid,Source $\rightarrow$ Atropa Belladona,Use $\rightarrow$ Produces hallucinations
• D
  $(b)$ Molecules $\rightarrow$ Morphine,Source $\rightarrow$ Papaver somniferum,Use $\rightarrow$ Sedative and painkiller