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
Which of the following is the most common site for syphilitic aneurysm 
Select and explain. 
A. Descending aorta, B. Ascending aorta, C. Internal carotid artery, D. External carotid artery
B: Ascending aorta
Answer: B: Ascending aorta 
Explanation: Syphilitic aneurysm most frequently occurs in ascending aorta. Syphilitic aneurysm occurs in tertiary stage of syphilis.