This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
[{'content': 'All of the following are branched chain amino acids EXCEPT: \nSelect and explain. \nA. Leucine, B. Lysine, C. Isoleucine, D. Valine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: There are three branched chain amino acids: Valine, Leucine and Isoleucine. Branching is a difficult thing to be done (just an idea to learn). So, all these branched chain amino acids are essential (required in diet). Extra Information: Branched Chain Amino Acids All are non-polar (Isoleucine is most non-polar) Leucine is Ketogenic Valine is Glucogenic Isoleucine- both Ketogenic and Glucogenic Amino acid that can be a fuel for brain is Isoleucine', 'role': 'assistant'}]