This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
The following are gas producing salmonella except- 
Select and explain. 
A. S. typhi, B. S. enteritidis, C. S. typhimurium, D. S. choleraesuis
A: S. typhi
Answer: A: S. typhi 
Explanation: Salmonella ferment sugar producing acid & gas except S. typhi which is anerogenic. SALMONELLA are motile with the presence of peritrichous flagella except Salmonella gallinarum and Salmonella pullorum ,which are non-motile.