In nucleosides, the mth N-atom of the pyrimidine base is joined to the nth C-atom of the ribose sugar moiety. Here m and n are

A nucleoside consists of a pentose sugar to which a nitrogen base is attached by a glycosidic bond. The sugar may be ribose or deoxyribose. The nitrogenous bases are purines or pyrimidines. In the case of DNA, the sugar is ribose and the nitrogenous base is purines. The nitrogen base is attached to the C-1 of the pentose sugar. Thus, we can state that in a nucleoside, the 1st N-atom of the pyrimidine base is joined to the 1st C-atom of the ribose sugar moiety.

Hence, the correct answer is (A) 1,1.