This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'The Most common cause of a Mycotic aneurysm is \nSelect and explain. \nA. Candida albicans, B. Treponema pallidum, C. Staphylococcus aureus, D. Pseudomonas aeuriginosa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Primary infection of the aoic wall results in aneurysm formation termed mycotic aneurysms, the pathogens usually are bacteria, most common being Staphylococcus aureus, Staphylococcus epidermidis, Salmonella, and Streptococcus. ref - Harrisons internal medicine 20e pg1918', 'role': 'assistant'}]