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': 'Cyst form is found in \nSelect and explain. \nA. Dientamoeba fragilis, B. B. Coli, C. T. vaginalis, D. T. Intestinalis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]