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: Medicine
Subdural empyema is most commonly caused by - 
Select and explain. 
A. H. influenzae, B. Staphylococus aureus, C. Streptococcus pneumoniae, D. E. Coli
C: Streptococcus pneumoniae
Answer: C: Streptococcus pneumoniae 
Explanation: None