This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Persistent diarrhoea in AIDS is caused by A/E - \nSelect and explain. \nA. Microspora, B. Cryptococcus, C. Cryptosporidia, D. Isospora belli', 'role': 'user'}, {'content': 'Answer: C \nExplanation: repeat', 'role': 'assistant'}]