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
Which of the following anticancer drug is excreted by lungs ? 
Select and explain. 
A. 5–Fluorouracil, B. Cyclophosphamide, C. Doxorubicin, D. Cisplatin
A: 5–Fluorouracil
Answer: A: 5–Fluorouracil 
Explanation: 5-Fluorouracil is rapidly metabolized in liver to produce biologically inactive metabolites which are eventually con­verted to carbon dioxide and eliminated by lungs.
Excretion of 80% of 5-FU can be accounted for by conversion to carbon dioxide within 12 hour of administration though its excretion in urine is only 15%.
Also note other drugs excreted by lungs are procainamide, procaine and antipyrine.