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: Microbiology
[{'content': 'Staphylococcus aureus differs from staphylococcus epidermidis by - \nSelect and explain. \nA. Is coagulase positive, B. Forms white colonies, C. A common cause of UTI, D. Causes endocarditis in drug addicts', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]