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': 'Cell wall deficient organisms are \nSelect and explain. \nA. Chlamydia, B. Mycoplasma, C. Streptococcus, D. Anaerobes', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Mycoplasma Mycoplasma Smallest free living organism, are prokaryotes Lack cell wall, are bounded by a triple layered unit membrane that contains sterol (therefore mycoplasmas require sterol for growth). Their lack of cell wall is associated with cellular pleomorphism and resistance to cell wall - active antimicrobial agents, such as penicillins and cephalosporins (13 - lactam drugs). Multiplication is by binary fission. Unique among prokaryotes is the requirment of most mycoplasmas for cholesterol and related sterols.", 'role': 'assistant'}]