A patient has subclinical folate deficiency. Which of the following drug cannot precipitate megaloblastic anemia in this patient?

Megaloblastic anaemia can be caused by a deficiency of folic acid or vitamin B12. The drugs that can result in a deficiency of folic acid include: B – B12 and folic acid deficiency A – Alcohol T – Trimethoprim S – Sulfasalazine M – Metformin A – Antifolates (Methotrexate, pyrimethamine, proguanil) N – N2O