This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumonia, Bronchiectasis, and Lung Abscess, Subject name: Medicine
Pneumatocele is commonly caused by: 
Select and explain. 
A. Streptococcus pneumonia, B. Haemophilus influenza, C. Serratia marcescens, D. Klebsiella pneumonia
A: Streptococcus pneumonia
Answer: A: Streptococcus pneumonia 
Explanation: Ans. (a) Streptococcus pneumonia* Pneumatocoele often occur as a sequela to acute pneumonia, commonly caused by Staphylococcus aureus. Pulmonary pneumatoceles are thin-walled, air- filled cysts that develop within the lung parenchyma. They can be single emphysematous lesions but are more often multiple. Also occur with other agents, including Streptococcus pneumoniae, Haemophilus influenzae, Escherichia coli, group Astreptococci, Serratia marcescens, Klebsiella pneumoniae, adenovirus, and tuberculosis" Pneumatocele formation is associated with hyperimmunoglobulin E (IgE) syndrome (Buckley- Job syndrome).