This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Cancer, Subject name: Pharmacology
[{'content': 'Folinic acid is given for which toxicity: \nSelect and explain. \nA. Methotrexate, B. Cisplatin, C. Doxorubicin, D. Cyclophosphamide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. MethotrexateMethotrexate is drug which inhibit the dihydrofolate reductase enzyme which further blocks the conversion of dihydrofolate to tetrahydrofolate. So in case of toxicity we give tetrahydrofolate from outside in form of folinic acid or leucovorin.', 'role': 'assistant'}]