This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Medicine
Most common cause of epidural abscess - 
Select and explain. 
A. Staphylococcus, B. Streptococcus, C. Gram negative bacilli, D. Microaerophilic anaerobic streptococci
A: Staphylococcus
Answer: A: Staphylococcus 
Explanation: Ans. is 'a' i.e., Staphylococcuso Therefore spinal epidural abscess is much more common than the intracranial epidural abscess.# Spinal epidural abscess is more common by a factor of nine to one.Causes of epidural abscess