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': 'Atypical Pneumonia is caused by: \nSelect and explain. \nA. Staphylococcus, B. Streptococcus, C. Chlamydia, D. H. Influenza', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chlamydia', 'role': 'assistant'}]