This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which of the following anticancer drug is excreted by lungs? \nSelect and explain. \nA. 5-Fluorouracil, B. Cyclophosphamide, C. Doxorubicin, D. Cisplatin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fluorourri ul U, -FU) is conveed in the body to the corresponding nucleotide 5-fluoro-2-deoxyuridine monophosphate, which inhibits thymidylate synthase and blocks the conversion of deoxyuridilic acid to deoxythymidylic acid. Metabolites are primarily excreted through the lungs as carbon dioxide. A small poion of a dose is excreted in urine as unchanged drug ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:824', 'role': 'assistant'}]