What is this unknown bacteria likely to be

-gram-negative
-enteric bacteria
-rod
-non motile
-faculatative anaerobe
-ferments glucose, lactose, sucrose, mannitol, and maltose with gas
-Negative geletin liquefaction test
-positive methyl red test
-negative voges-proskauer test
-positive citrate utilization
-positive catalase test
-positive reductase test





Choices:

Pseudomonas
Alcaligenes
Citrobacter
Enterobacter
Providencia
Salmonella
Serratia
Erwinia
Escherichia
Proteus
Morganella
Edwardsiella
Klebsiella
Shigella

Methyl red test => Mixed acid fermentation with glucose
Negative VP test => Acetyl Methyl Carbinol present
Positive Citrate test => Able to use citrate as carbon source
Positive Catalase test => The enzyme catalase is present
Positive Reductase test (I assume it's Nitrate Reductase test) => Nitrate Reduction can occur

The most likely ones are Enterobacter and Klebsiella, you should go on from there.