During formation of nucleotide, esterification takes place between

During the formation of nucleotide esterification, a phosphodiester bond occurs when the hydroxyl groups in phosphoric acid react with hydroxyl groups on other molecules to form an ester bonds. Usually, esterification occurs between 5¹ OH of sugar and OH of phosphoric acid. 

Hence, the correct answer is option A) 5¹ OH of sugar and OH of phosphoric acid.