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: Microbiology
Amongst the following, which is the rarest oppounistic fungal infection seen in AIDS patient: September 2008 
Select and explain. 
A. Cryptococcosis, B. Candidiasis, C. Histoplasmosis, D. Aspergillosis
D: Aspergillosis
Answer: D: Aspergillosis 
Explanation: Ans. D: Aspergillosis The commonly encountered fungal infections in HIV-positive patients are candidosis, cryptococcosis and histoplasmosis. Other fungal infections like coccidiodomycosis and Penicilliosis marneffei are seen usually in geographically restricted areas.