This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'All are purely Glucogenic amino acids except ? \nSelect and explain. \nA. Valine, B. Alanine, C. Tryptophan, D. Methionine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) TryptophanRef - Lippincott's 4/e, / 261.", 'role': 'assistant'}]