Which of the following is an example of a carbonic anhydrase inhibitor?

A. Furosemide: Furosemide is a loop diuretic, not a carbonic anhydrase inhibitor. B. Spironolactone: Spironolactone is a potassium-sparing diuretic, not a carbonic anhydrase inhibitor. C. Acetazolamide: Correct. Acetazolamide is a carbonic anhydrase inhibitor used to treat conditions like glaucoma and edema. D. Hydrochlorothiazide: Hydrochlorothiazide is a thiazide diuretic, not a carbonic anhydrase inhibitor.