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
DCA media used in differentiation of which infection? 
Select and explain. 
A. Salmonella, B. Staph aureus, C. H. influenzae, D. Bordetella
A: Salmonella
Answer: A: Salmonella 
Explanation: 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.