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 of the following are bounded by membrane containing sterols: March 2011 \nSelect and explain. \nA. Klebsiella, B. Staphylococcus, C. Mycobacteria, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Mycoplasma Mycoplasma are devoid of cell walls The cells are bounded by a soft trilaminar unit membrane containing sterols', 'role': 'assistant'}]