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
Which one of the following bacteria contains mycolic acid in the cell wall? 
Select and explain. 
A. Escherichia, B. Mycoplasma, C. Mycobacteria, D. Staphylococcus
C: Mycobacteria
Answer: C: Mycobacteria 
Explanation: Ans. is 'c' i.e., Mycobacteria