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': 'Concentration of agar used for solid agar to Inhibit Proteus swarming \nSelect and explain. \nA. 1-2%, B. 0.50%, C. 6%, D. 5%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: For solid agar - 1-2%\nFor Semisolid agar - 0.5%\nFor solid agar to inhibit proteus swarming - 6%', 'role': 'assistant'}]