This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
All of the following statements about Pneumocystis Jiroveci are true except 
Select and explain. 
A. Usually associated with CMV infection, B. May be associated with Pneumatocele, C. Usually diagnosed by sputum examination, D. Causes disease only in the immunocompromised host
A: Usually associated with CMV infection
Answer: A: Usually associated with CMV infection 
Explanation: Pneumocystis is an oppounistic fungal pulmonary pathogen that is an impoant cause of pneumonia in the immunocompromised host,such as those with HIV infection.PCP may be associated with the development of pneumatocoele & pneumothorax.Other classic findings in chest X ray consist of bilateral diffuse infiltrates beginning in the perihilar regions.A definitive diagnosis of PCP is made by histopathological staining /Immunofluorescence of sputum or BAL. Reference: Davidson edition23rd pg 585