Discussion
Hydrogen bond can be formed between the pair of atoms such as :
Answer: B
The pair is hydrogen and nitrogen.
A hydrogen bond forms between a hydrogen atom covalently bonded to an electronegative atom and a lone pair on another strongly electronegative atom, in biology almost always nitrogen or oxygen. So the bond itself links a hydrogen and an acceptor such as nitrogen, as in the N-H...N and N-H...O bonds of DNA base pairs.
Carbon is not electronegative enough to act as a normal acceptor, so the carbon pairs are wrong. Oxygen and nitrogen are both electronegative, but they are the donor and acceptor atoms; a hydrogen bond cannot form between them unless a hydrogen sits between them.
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