A 5-carbon compound of Krebs cycle is a key compound in nitrogen metabolism. It is

Answer: Option C

A 5-carbon compound of Krebs cycle is a key compound in nitrogen metabolism. It is α-Ketoglutaric acid.
The Krebs cycle is present in every cell that uses oxygen to produce energy. This metabolic pathway is used as an anabolic cellular principle but also in the presence of catabolism.
α-Ketoglutaric acid (2-oxoglutaric acid) is one of two ketone derivatives of glutaric acid. It is the keto acid produced by deamination of glutamate, and is an intermediate in the Krebs cycle.