Which organic acid is produced at the end of the TCA cycle?

The TCA (Tricarboxylic Acid) cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to release stored energy.

The cycle begins with the condensation of acetyl-CoA with oxaloacetic acid to form citric acid.

Through a series of steps involving oxidation and decarboxylation, various intermediates like $\alpha$-ketoglutaric acid, succinic acid, fumaric acid, and malic acid are formed.

In the final step of the cycle, malic acid is oxidized by the enzyme malate dehydrogenase to regenerate oxaloacetic acid.

This regenerated oxaloacetic acid is then ready to combine with another molecule of acetyl-CoA to start the cycle anew. Thus, oxaloacetic acid is the organic acid produced at the end of the TCA cycle.

Answer: Oxaloacetic acid