This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels, Subject name: Pathology
[{'content': 'Risk of aneurysm rupture is >25% per year when the size is greater than \nSelect and explain. \nA. 4 cm, B. 6 cm, C. 7 cm, D. 8 cm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) 7cm(Ref: Guidelines for the treatment of abdominal aortic aneurysms. J Vase Surg. 2003,37(5):1106)The annual risk of rupture based upon aneurysm size is estimated as follows:Less than 4.0cm in diameter =-0%Between 4.0 to 5cm in diameter =1%Between 5.0 to 6cm in diameter =11%>6.0cm in diameter =25%', 'role': 'assistant'}]