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: Social & Preventive Medicine
[{'content': 'Persistent diarrhoea in AIDS is caused by A/E -a)  Micro sporab)  Cryptococcus c)  Cryptosporidiad)  Isospora bellie) Giardia lamblia \nSelect and explain. \nA. a, B. b, C. ce, D. ae', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]