This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 1 (Protozoology), Subject name: Microbiology
[{'content': 'A patient with AIDS had an acute episodes of diarrhea. The stool examination revealed an oval structure (8 to 9u in diameter) that was acid-fast and fluorescent blue under ultraviolet light. The most likely identification of this organism is? \nSelect and explain. \nA. Cryptosporidium, B. Cyclospora, C. Enterocytozoon, D. Giardia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acid fast structures that autofluoresce under UV light suggests the coccidian protozoa as the cause of the diarrhea. The size of 8-9 microns helps to arrive at the answer of Cyclospora. =Cyclospora, Cystoisospora and Cryptosporidium are coccidian protozoa that cause oppounistic intestinal infections in HIV patients.', 'role': 'assistant'}]