A 75-year-old man with a 40-pack-year history of smoking and hypercholesterolemia is diagnosed with severe atherosclerosis. Atherosclerotic occlusion of which the following arteries would result in insufficient perfusion of the urinary bladder?
(A) external iliac
(B) Inferior epigastric
(C) Internal iliac
(D) Internal pudendal
(E) Lateral sacral
Answer: (C) Internal iliac