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: Medicine
[{'content': 'The one organism which is responsible for coronary artery disease - \nSelect and explain. \nA. Chlamydia, B. Klebsiella, C. E. coli, D. Mycoplasma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]