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': "Not an enrichment medium ? \nSelect and explain. \nA. Selenite F broth, B. Tetrathionate broth, C. Alkaline peptone water, D. Loeffler's serum", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Loeffler's serum", 'role': 'assistant'}]