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': 'Glucogenic amino acid are all except \nSelect and explain. \nA. Valine, B. Alanine, C. Tryptophan, D. Methionine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tryptophan is both glucogenic &ketogenic. Others are purely glucogenicRef: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 27', 'role': 'assistant'}]