Identify the enzyme that is involved in the following reaction.

α-ketoglutaric acid + ${{\mathrm{NH}}_4}^{+}$ + NADPH→ Glutamate+ ${\mathrm{H}}_2\mathrm{O}$+ NADP

• A

  Glutamate transaminase

• B

  Glutamate dehydrogenase

• C

  α-ketoglutarate kinase

• D

  Glutamate synthetase