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: Orthopaedics
Acute Osteomyelitis is most commonly caused by - 
Select and explain. 
A. Staphylococcus aureus, B. Actinomyces bovis, C. Nocardia asteroids, D. Borrelia vincentii
A: Staphylococcus aureus
Answer: A: Staphylococcus aureus 
Explanation: It is caused most commonly by staphylococcus aureus.