A patient with a history of cardiac arrest and a miscarriage in the first trimester is currently receiving leucovorin and oxaliplatin injections. Considering the patient's medications and history, what is the most likely reason for prescribing leucovorin in this context?
To address a diagnosis of megaloblastic anemia. To mitigate the side effects of oxaliplatin chemotherapy. To support recovery from a recent miscarriage. To treat vitamin B12 deficiency.