AIIMS 2019 Botany Nucleic Acids MCQ Question

A nucleoside consists of a nitrogenous base attached to a sugar molecule, specifically ribose or deoxyribose, without any phosphate groups. In option A, adenosine is a nucleoside formed from adenine and ribose, while adenylic acid (AMP) and cytosine are not nucleosides; adenylic acid is a nucleotide, and cytosine is solely a nitrogenous base. Options B and C include guanosine and cytidine, which are also nucleosides, but they do not contain only nucleosides as they mix with nucleotides. Option D includes guanylic acid, which is a nucleotide, thus failing to meet the criteria for a nucleoside.