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': 'Highly Cardiotoxic is: \nSelect and explain. \nA. Bleomycin, B. Doxorubicin, C. MTX, D. Mitomycin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Doxorubicin', 'role': 'assistant'}]