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 of the following is an enrichment medium \nSelect and explain. \nA. Blood agar, B. Selenite F Broth, C. Mac Conkey agar, D. Nutrient Broth', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]