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
Which bacteria show Rotatory motility 
Select and explain. 
A. Trichomonas, B. Mycoplasma, C. Balantidium, D. Borrelia
C: Balantidium
Answer: C: Balantidium 
Explanation: Balantidium coli is ciliate which shows rotatory motility.