(B) The chemical structure of $Cimetidine$ contains a cyano group $(-CN)$ attached to the nitrogen atom in the side chain. Other options like $Ranitid

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(B) The chemical structure of $Cimetidine$ contains a cyano group $(-CN)$ attached to the nitrogen atom in the side chain. Other options like $Ranitidine$ contain a nitro group $(-NO_2)$ and $Famotidine$ contains a sulfamoyl group $(-SO_2NH_2)$. Therefore,$Cimetidine$ is the correct answer.