This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
[{'content': 'Tryptophan is \nSelect and explain. \nA. Glucogenic, B. Ketogenic, C. Both glucogenic & ketogenic, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: During metabolism Tryptophan, pa of carbon skeleton enters ketogenic pathway and rest glucogenic pathway. Alanine is glucogenic and Acetoacetyl CoA is ketogenic.', 'role': 'assistant'}]