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
Cell wall structure is found in all except ? 
Select and explain. 
A. Staph aureus, B. Pseudomonas aeruginosa, C. Mycoplasma pneumoniae, D. Corynebacterium diphtherae
C: Mycoplasma pneumoniae
Answer: C: Mycoplasma pneumoniae 
Explanation: Ans. is 'c' i.e., Mycoplasma pneumoniae