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: Medicine
All of the following organisms cause interstitial pneumonia except - 
Select and explain. 
A. Pneumocystis carinii, B. Mycoplasma pneumoniae, C. Legionella pneumophilia, D. Haemophilus influenzae
D: Haemophilus influenzae
Answer: D: Haemophilus influenzae 
Explanation: None