Trimethoprim acts by:: (A) Inhibiting peptidyl transferase enzyme, (B) Inhibiting dihydrofolate reductase enzyme, (C) Inhibiting Dihydropteroate synthase enzyme, (D) Binds to 50s ribosomal unit and prevents protein synthesis
Answer is B. Trimethoprim, Methotrexate and pyrimethamine inhibits dihydrofolate reductase enzyme and prevents formation of Tetrahydrofolic acid and from Dihydrofolic acid.