Thymidine is

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(B) nucleoside is formed by the combination of a nitrogenous base and a pentose sugar.Thymidine is formed by the combination of the nitrogenous base $

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Nucleoside

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(B) nucleoside is formed by the combination of a nitrogenous base and a pentose sugar.Thymidine is formed by the combination of the nitrogenous base $Thymine$ and the sugar $Deoxyribose$.Since it lacks a phosphate group,it is classified as a nucleoside.In contrast,a nucleotide contains a nitrogenous base,a pentose sugar,and a phosphate group (e.g.,Thymidylic acid).

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$A$: Pyrimidines are nitrogenous bases with a single-ring structure.
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