This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
Osteomyelitis of spine is caused by most common organism ? 
Select and explain. 
A. Staphylococcus aureus, B. Pseudomonas, C. Tuberculosis, D. Streptococcus
A: Staphylococcus aureus
Answer: A: Staphylococcus aureus 
Explanation: Staphylococcus aureus , overall , worldwide staph. aureus is the commonest organism. in India tuberculosis is the commonest. ref : maheswari 9th ed