This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Citrate as a sole source of carbon is utilized by 
Select and explain. 
A. Staphylococcus, B. Salmonella, C. Shigella, D. Escherichia
B: Salmonella
Answer: B: Salmonella 
Explanation: Citrate is used by salmonella as sole source of carbon But citrate test positive: Salmonella Typhimurium Salmonella Paratyphi A is citrate negative Ref: Elmer W Koneman 5th ed Pg 186