<prompt> An antimetabolite which undergoes biotransformation to form an inhibitor of DNA polymerase is -VinablastineCytosine arabinosideMethotrexateChlorambucil  <response>: Ans. is b i.e., Cytosine arabinosideo Cytarabine is phosphorylated in the body to the corresponding nucleotide which inhibits DNA synthesis by inhibiting DNA polymerase. 