This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumonia, Subject name: Medicine
The following X-ray was taken after Staph. aureus pneumonia. Diagnosis is: 
Select and explain. 
A. Pneumothorax, B. Lung abscess, C. Empyema, D. Increased bronchovascular markings
A: Pneumothorax
Answer: A: Pneumothorax 
Explanation: Pneumatoceles which is a characterstic feature of Staph aureus pneumonia - can rupture and lead to the formation of Pneumothorax(shown in the given X ray)