This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Microbiology
[{'content': 'A HIV positive individual having diarrheal episodes stool examination reveals on oocyst of size 8-10 Micron, what could be the diagnosis? \nSelect and explain. \nA. Cyclospora, B. Cryptococcus, C. Cryptosporidium parvum, D. Isospora', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Parasites Size of oocyst Cryptosporidium parvum 4-6 micron Cyclospora 8-10 micron Isospora 23-36 micron They all are acid fast so the appear similar in colour under acid fast stain. So, size of oocyst is used to identify them.', 'role': 'assistant'}]