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': 'DIENES phenomenon s used for \nSelect and explain. \nA. Mycoplasma, B. Chlamydiae, C. Plague, D. Diptheria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]