Identify the molecules (a) and (b) shown below and select the right option:

- A(a) Morphine; Source: Papaver somniferum; Use: Sedative and pain killer
- B(b) Cocaine; Source: Erythroxylum coca; Use: Accelerates transport of dopamine
- C(a) Heroin; Source: Cannabis sativa; Use: Depressant
- D(b) Cannabinoid; Source: Atropa belladonna; Use: Hallucinogen