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 microorganism has sterol in the cell wall? \nSelect and explain. \nA. Mycoplasma, B. Virus, C. Fungi, D. Protozoa', 'role': 'user'}, {'content': "Answer: A \nExplanation: The mycoplasmas are cell wall-lacking bacteria that do not synthesize the precursors of peptidoglycan. A unique characteristic is that some genera require cholesterol for growth; unesterified cholesterol is a unique component of the membranes of both sterol-requiring and non-sterol-requiring species if present in the medium. Ref: Brooks G.F. (2013). Chapter 3. Classification of Bacteria. In G.F. Brooks (Ed), Jawetz, Melnick, & Adelberg's Medical Microbiology, 26e.", 'role': 'assistant'}]