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
HIV pt with malabsotion, fever, chronic diarrhoea, with acid fast positive organism. What is the causative agent ? 
Select and explain. 
A. Giardia, B. Microsporidia, C. Isospora, D. E. histolytica
C: Isospora
Answer: C: Isospora 
Explanation: Ans. is 'c' i.e., Isospora Protozoa commonly causing diarrhea in HIV patients and have acid fast oocyst are cryptosporidia and isospora belli.