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
Mode of excretion of cyclophosphamide is ? 
Select and explain. 
A. Lung, B. Liver, C. Kidney, D. Skin
C: Kidney
Answer: C: Kidney 
Explanation: Ans. is 'c' i.e., Kidney Cyclophosphomide is primarily metabolized (80%) and metabolites are exceed in urine. 10 to 20% is excreted unchanged in urine and 4% is excreted in bile.