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': 'Common cause of diarrhoea in AIDS cases is due to \nSelect and explain. \nA. Plasmodium falciparum, B. Cryptosporidium, C. Ascaris lumbricoides, D. Taenia solium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]