This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
Ascending aoa Involvement is the commonest site of which aneuryam 
Select and explain. 
A. Syphilitic, B. Atherosclerotic, C. Mycotic, D. None of the above
A: Syphilitic
Answer: A: Syphilitic 
Explanation: Syphilitic aneurysm Teiary sypilis... Trepenomonas has affinity for vaso vasorum of mainly thoracic aoa leads to obliterative endaeritis leads to ischemic damage to the aoic media and aneurysm Ramdas Nayak page no. 379