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
This IMViC pattern of biochemical reactions is indicative of which bacteria 
Select and explain. 
A. E.coli and Klebsiella, B. E.coli and Enterobacter, C. Enterobacter and Klebsiella, D. Klebsiella and Shigella
C: Enterobacter and Klebsiella
Answer: C: Enterobacter and Klebsiella 
Explanation: Klebsiella and Enterobacter shows the following biochemical reactions: Indole test negative Methyl red test negative Voges Proskauer test positive Citrate utilization positive E.coli is indole positive, Escherichia coli and Shigella dysenteriae are citrate negative.