<prompt> Low molecular weight heparin inhibitsFactor XaFactor Xa and II aFactor II aFactors II, VII, IX and X  <response>: Prophylaxis of neural tube defects require treatment with folic acid.Methotrexate toxicity can be prevented by 5-formyltetrahydrofolate folinic acid.Pernicious anemia requires the therapy with vitamin B12Anemia associated with chronic renal failure is treated with erythropoietin. 