Wait, isn't doxorubicin an antitumor antibiotic? I think it's got to be something related to DNA or protein synthesis. C - inhibits peptidyl transferase seems more plausible.
Doxorubicin is a chemotherapy drug, so it's got to be inhibiting something important for cancer cells. I'm going with A - inhibits topoisomerase II. Sounds like the right mechanism to me.
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