An antimetabolite which undergoes biotransformation to form an inhibitor of DNA polymerase is -: (A) Vinablastine, (B) Cytosine arabinoside, (C) Methotrexate, (D) Chlorambucil
Answer is B. 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.