<prompt> Pneumothorax could be a complication ofStaphylococcal pneumoniaPneumococcal pneumoniaKlebsiella pneumoniaViral pneumonia  <response>: Staphylococcal pneumonia is the most common cause of amongst all pneumoniaPurulent pericarditisPneumatocelesPneumothoraxLung abscessEmpyemaOther organisms commonly causing empyma Streptococcus pyogenes, Pneumococci 