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
[{'content': 'Negative staining is used to demonstrate \nSelect and explain. \nA. Bacterial spore, B. Bacterial flagella, C. Bacterial capsule, D. Bacterial fimbriae', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]