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': 'In nutrient agar conc. of agar is - \nSelect and explain. \nA. 1%, B. 2%, C. 3%, D. 4%', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 2% Nutrient agar is made by adding 2% agar to nutrient broth.", 'role': 'assistant'}]