This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'The enzyme which is used as an anticancer drug - \nSelect and explain. \nA. L-asparginase, B. Cytosine arabinoside, C. Methotrexate, D. Vincristine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., L-asparginase o Leukemia cells are deficient in L-Asparagine synthase and depend on the supply of L-asparagine from medium. The enzyme L-asparaginase degrades L-asparagine to L-aspaic acid, depriving leukemic cells of essential metabolite-may cause cell death.", 'role': 'assistant'}]