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Identify the molecules $(A)$ and $(B)$ shown below and select the right option giving their source and use.
Molecule $\to $ Source $\to $ Uses

$(A)$ Cocaine $\to $ Erythroxylum coca $\to $ Accelerates the transport of dopamine
$(B)$ Heroin $\to $ Cannabis sativa $\to $ Depressant and slows down body functions
$(B)$ Cannabinoid $\to $ Atropa belladona $\to $ Produces hallucinations
$(A)$ Morphine $\to $ Papaver somniferum $\to $ Sedative and pain killer
Solution
Molecule $(A)$ represents structure of morphine. Morphine is the most abundant alkaloid found in Opium, the dried sap (latex) derived from shallowly slicing the unripe seedpods of the Opium, or common and/or edible poppy Papaver somniferum. Morphine is a potent opiate analgesic drug that is used to relieve severe pain.