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
Staphylococcus aureus differs from staphylococcus epidermidis by: 
Select and explain. 
A. Is coagulase-positive, B. Forms white colonies, C. A common cause of UTI, D. Causes endocarditis of prosthetic valve
A: Is coagulase-positive
Answer: A: Is coagulase-positive 
Explanation: None