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: Biochemistry
[{'content': 'Which amino acid is purely Ketogenic \nSelect and explain. \nA. Tyrosine, B. Leucine, C. Tryptophan, D. Isoleucine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Leucine and lysine are purely ketogenic, other amino acids given are both glucogenic and ketogenic.', 'role': 'assistant'}]