The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 68-year-old male comes to the physician for evaluation of right flank pain. He has a history of diabetes and peripheral artery disease. His blood pressure is 160/90 mm Hg. Physical examination shows abdominal tenderness and right flank tenderness. An ultrasound shows dilation of the right ureter and renal pelvis. Which of the following is the most likely underlying cause of this patient's condition?   (A) Renal artery stenosis   (B) Benign prostatic hyperplasia   (C) Common iliac artery aneurysm   (D) Urethral stricture
['(C) Common iliac artery aneurysm <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Renal artery stenosis \n (B) Benign prostatic hyperplasia \n (C) Common iliac artery aneurysm \n (D) Urethral stricture <> possible answers', "  A 68-year-old male comes to the physician for evaluation of right flank pain. He has a history of diabetes and peripheral artery disease. His blood pressure is 160/90 mm Hg. Physical examination shows abdominal tenderness and right flank tenderness. An ultrasound shows dilation of the right ureter and renal pelvis. Which of the following is the most likely underlying cause of this patient's condition? <> context@"]