This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human Immunodeficiency Virus, Subject name: Microbiology
Which of the following is not seen in HIV Patient with CD4 count less than 100 Per micro litre, who has non productive cough : 
Select and explain. 
A. Mycobacterium tuberculosis, B. Pneumocystis carinii, C. Mycoplasma pneumonae, D. Cryptococcal infection
C: Mycoplasma pneumonae
Answer: C: Mycoplasma pneumonae 
Explanation: Ans. is 'c' i.e. Mycoplasma Pneumoniae Mycoplasma Pneumoniae is not among the opportunistic organisms causing Pneumonia in a patient with AIDS.Organisms causing Pneumonia in AIDS patientBacterial - S. pneumoniae (most common)*H. influenza Parasite - Pneumocystis carinii* Fungal - Cryptococcal*Aspergillus Coccidioides immitis HistoplasmosisOpportunistic infections*CD4-Tcell Counts at which they developMycobacterium T.B.Candida (oral thrush)Herpes Zoster* 400-200Pneumocystis cariniiCryptococcus neoformansToxoplasma gondii* less than 200MycobacteriumAvium intracellulare* less than 50