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': 'Which one of the following is true - \nSelect and explain. \nA. Agar has nutrient properties, B. Chocolate medium is selective medium, C. Addition of selective substances in a solid medium is called enrichment media, D. Nutrient broth is basal medium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]