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': 'DCA media used in differentiation of which infection? \nSelect and explain. \nA. Salmonella, B. Staph aureus, C. H. influenzae, D. Bordetella', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Salmonella Deoxycholate citrate agar (DCA) medium is a selective medium for Salmonella and Shigella. It is also used as a differential medium to differentiate lactose fermenter from non-lactose fermenting enteric pathogens. Salmonella and Shigella (except Shigella Sonnei) are non-lactose fermenters.", 'role': 'assistant'}]