Identify the molecules (a) and (b) shown below and select the right option giving their source and use. (a) Molecule - Cocaine; Source - Erythroxylum coca; Use - Accelerates the transport of dopamine (b) Molecule - Herion; Source - Cannabis sativa; Use -Depressant and slows down body functions (a) Molecule - Morphine; Source - Papaver somniderum; Use - Sedative and pain killer (b) Molecule - Dopamine; Source - Altropa belladona; Use - Produces hallucinations

The molecule “a” is the chemical structure of cocaine, an opioid that is obtained from the seeds of the poppy plant (Papaver somniferum).Coca alkaloid or cocaine is a cannabinoid that is obtained from the coca plant Erythroxylum coca, native to South America.It interferes with the transport of the neurotransmitter dopamine i.e, accelerates the transport of dopamine. It has a potent stimulating action on the central nervous system, producing a sense of euphoria and increased energy.The excessive dosage of cocaine causes hallucinations. Whereas, the molecule “b” is the chemical structure of a cannabinoid molecule. These are the chemicals that interact with cannabinoid receptors present in the brain.So, the correct answer is option D.