This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria), Subject name: Microbiology
[{'content': 'Cell wall can be demonstrated by : \nSelect and explain. \nA. Microdissection, B. Electron microscopy, C. Differential staining, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The cell walls can be demonstrated by: (1) Differential staining procedure (2) Electron microscopy (3) Plasmolysis (4) Microdissection (5) Mechanical rupture of the cell (6) Serological test by exposure to specific antibodies.', 'role': 'assistant'}]