<prompt> Which of the following anticancer drug is excreted by lungs ?5FluorouracilCyclophosphamideDoxorubicinCisplatin  <response>: 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. 