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 drug is excreted unchanged in urine ? 
Select and explain. 
A. Verapamil, B. Furosemide, C. Propranolol, D. Thiopentone
B: Furosemide
Answer: B: Furosemide 
Explanation: Ans. is 'b' i.e., Furosemide Furosemide pharmacokinetics Furosemide is rapidly absorbed orally but bioavailability is about 60%. Lipid solubility is low and it is highly bound to plasma proteins. It is pay conjugated by glucuronic acid and is mainly excreted unchanged by glomerular filtration and tubular secretion.