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
The one organism which is responsible for coronary artery disease - 
Select and explain. 
A. Chlamydia, B. Klebsiella, C. E. coli, D. Mycoplasma
A: Chlamydia
Answer: A: Chlamydia 
Explanation: None