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': 'Culture media used for diagnosis of EHEC O157:H7 is- \nSelect and explain. \nA. O culture, B. Sorbitol MacConkey media, C. XLD agar, D. Deoxycholate media', 'role': 'user'}, {'content': 'Answer: B \nExplanation: EHEC can be differentiated from other E.coli as it is sorbitol non fermenter, hence it produces colorless colony on\xa0Sorbitol MacConkey media whereas others can ferment sorbitol producing pink colony.', 'role': 'assistant'}]