<prompt> All are dihydrofolate reductase antagonists, EXCEPT-MethotrexateCytosine arabinosidePentamidinePyrimethamine  <response>: Ans. is b i.e., Cytosine Arabinoside Dihydrofolate reductase antagonists are o Methotreyate o Pentamidine o Trimethoprim o Pyrimetham ne 