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
The cell wall deficient bacteria 
Select and explain. 
A. Rickettsiae, B. Mycoplasma, C. Chlamydiae, D. Ehrlichiae
B: Mycoplasma
Answer: B: Mycoplasma 
Explanation: None