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 bacterial cell wall has all of the following properties except: 
Select and explain. 
A. It consists of a mixed polymer called peptidoglycon, B. It is the structure principally responsible for the reaction of gram staining, C. It is a unique flexible plastic structure, D. It contains D-isomers of amino acids
C: It is a unique flexible plastic structure
Answer: C: It is a unique flexible plastic structure 
Explanation: None