This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy: General Principles, Subject name: Pharmacology
[{'content': 'Which is the most active single chemotherapeutic agent in the treatment of leiomyosarcoma? \nSelect and explain. \nA. Adriamycin, B. Daunorubicin, C. Methotrexate, D. Cisplatin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) Adriamycin(Ref: KDT 8th/e p926)Doxorubicin (adriamycin) and daunorubicin are anthracycline derivatives.Daunorubicin is mainly used for hematological malignancies (acute leukemia) whereas doxorubicin is used for solid tumors and soft tissue sarcomas.', 'role': 'assistant'}]