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
Eaton agent is - 
Select and explain. 
A. Chlamydia, B. Mycoplasma pneumoniae, C. Klebsiella, D. H. influenzae
B: Mycoplasma pneumoniae
Answer: B: Mycoplasma pneumoniae 
Explanation: Ans. is 'b' i.e., Mycoplasma pneumoniae