<prompt> Tricarboxylic acid cycle to be continuous requires the regeneration ofPyruvic acidoxaloacetic acidα-oxoglutaric acidMalic acid  <response>: Oxaloacetate may be viewed as a catalyst, which enters into the reaction, causes complete oxidation of acetyl CoA and comes out of it without any change.Reference: Vasudevan 7th ed, pg 249 