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 HACEK group of bacteria is ? \nSelect and explain. \nA. Anaerobes, B. Includes coxiella burnetii, C. Grain positive, D. Require CO2 for growth', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]