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
Atypical Pneumonia is caused by: 
Select and explain. 
A. Staphylococcus, B. Streptococcus, C. Chlamydia, D. H. Influenza
C: Chlamydia
Answer: C: Chlamydia 
Explanation: Chlamydia