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: Pediatrics
Pneumatocele is caused by- 
Select and explain. 
A. Staphyococcus, B. Streptococcus, C. Streptococcus pneumoniae, D. All
A: Staphyococcus
Answer: A: Staphyococcus 
Explanation: Ans. is 'a' i.e., Staphylococcus Pneumatoceles o These are multiple thin walled air containing cysts. o Staphylococcus aureus is the most common organism causing pneumatoceles and pneumatoceles are considered pathognomonic of staphylococcal pneumonia. o E.coli and klebsiella pneumonia may have pneumatoceles.