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: Pathology
[{'content': 'Which of the following blood vessels is most commonly affected by atherosclerosis \nSelect and explain. \nA. Popliteal artery, B. Thoracic aorta, C. Abdominal aorta, D. Coronary arteries', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Abdominal aorta especially region below the renal arteries and above the iliac bifurcation is the most commonly affected vessel.', 'role': 'assistant'}]