Read the following statements:a. Heroin,commo | vedclass

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(D) Statement $(a)$ is correct: Heroin,also known as smack,is diacetylmorphine,which is obtained by the acetylation of morphine.Statement $(b)$ is inc

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$(a) \& (d)$

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(D) Statement $(a)$ is correct: Heroin,also known as smack,is diacetylmorphine,which is obtained by the acetylation of morphine.Statement $(b)$ is incorrect: Cocaine is obtained from the plant $Erythroxylum \; coca$,whereas $Papaver \; somniferum$ is the source of morphine.Statement $(c)$ is incorrect: Dopamine can act as both an excitatory and inhibitory neurotransmitter depending on the receptor,but in the context of drug addiction pathways,it is often discussed for its role in reward signaling; however,it is not strictly classified as purely excitatory in all contexts.Statement $(d)$ is correct: Morphine is a very effective sedative and painkiller,widely used in medicine for patients who have undergone surgery.

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