Pneumothorax could be a complication of –: (A) Staphylococcal pneumonia, (B) Pneumococcal pneumonia, (C) Klebsiella pneumonia, (D) Viral pneumonia
Answer is A. Staphylococcal pneumonia is the most common cause of (amongst all pneumonia)

Purulent pericarditis
Pneumatoceles
Pneumothorax
Lung abscess
Empyema
Other organisms commonly causing empyma → Streptococcus pyogenes, Pneumococci