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Which of the bond in the nucleotide is broken 1st in BER?

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Which of the bond in the nucleotide is broken 1st in BER?

(a) Bond between two consequent bases

(b) Bond between base and sugar

(c) Bond between base and phosphate

(d) Bond between two complementary bases

The question was posed to me in a job interview.

This is a very interesting question from Repair of DNA Damage: MMR, BER topic in portion DNA Mutation, DNA Repair, Transposable Elements of Cytogenetics

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Correct choice is (b) Bond between base and sugar

To elaborate: The glycosidic bond between the sugar residue and the nitrogenous base is the 1st to be broken by BER glycosylases generating an abasic site.

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