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': 'True about mycoplasma - \nSelect and explain. \nA. Obligate intracellular organism, B. Penicillin is effective treatment, C. Require cholesterol for growth, D. Have thick cell wall', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]