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
[{'content': 'Persistent diarrhoea in AIDS is caused byA/E -a) Microsporab) Cryptococcus c) Cryptosporidiad) Isospora belli e) Giardia lamblia \nSelect and explain. \nA. ab, B. ad, C. be, D. ce', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]