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': 'Which Branched-chain amino acid is purely ketogenic- \nSelect and explain. \nA. Lysine, B. Leucine, C. Isoleucine, D. Valine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Leucine o Branched-chain amino acids are leucine, Isoleucine, and Valine. Leucine is purely ketogenic. Isoleucine is both ketogenic and glucogenic. Valine is glucogenic.", 'role': 'assistant'}]