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': 'Which bacteria show Rotatory motility \nSelect and explain. \nA. Trichomonas, B. Mycoplasma, C. Balantidium, D. Borrelia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Balantidium coli is ciliate which shows rotatory motility.', 'role': 'assistant'}]