<prompt> Tryptophan is glucogenic ketogenic by producingAcetyl CoA alanineAcetoacetate fumarateAcetoacetate arginineArginine alanine  <response>: The major metabolic fate of tryptophan is to be oxidized by tryptophan pyrrolase tryptophan di-oxygenase Step 1, Fig. 17.8. It is a hemoprotein. The enzyme is inducible by coicosteroids.iii. In this major pathway, the total 11 carbon atoms of tryptophan are catabolized as formyl group 1C which enters the one-carbon pool, alanine 3C, entering the glucose pathway and acetoacetate 4C, going to ketogenic pathway. So, tryptophan is both glucogenic and ketogenic. The remaining 3 carbons are removed as 3 CO2 molecules.Ref: DM Vasudevan - Textbook of Biochemistry, 6th edition, page no: 211 