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': 'In reference to the mycoplasmas, the following are true except - \nSelect and explain. \nA. They are inhibited by penicillins, B. They can reproduce in cell free media, C. They have an affinity for mammalian cell membranes, D. They can pass through filters of 450 nm pore size', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]