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': 'Which is the most active single chemotherapeutic agent in the treatment of Leiomyosarcoma - \nSelect and explain. \nA. Adriamycin, B. Doxorubicin, C. Methotrexate, D. b or a', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'b' or 'a' i.e., Doxorubicin or Adriamycin o Doxarubicin (adriamycin) has been shown to be an effective agent against leiomyosarcomas arising in the uterus. o The best responses in cases of soft tissue tumors have been observed with doxarubicin (adriamycin) and ifsofamide (not in option)", 'role': 'assistant'}]