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
Which is the most common micro-organism known to cause tropical pyomisitis ? 
Select and explain. 
A. Streptococcus viridans, B. Staphylococcus albus, C. Klebsiella pneumoniae, D. Staphylococcus aureus
D: Staphylococcus aureus
Answer: D: Staphylococcus aureus 
Explanation: Ans. is 'd' i.e., Staphylococcus aureus