This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure & Function of Protein, Subject name: Biochemistry
Branched chain amino acid which is both ketogenic and glucogenic - 
Select and explain. 
A. Leucine, B. Isoleucine, C. Valine, D. Tryptophan
B: Isoleucine
Answer: B: Isoleucine 
Explanation: Ans. is 'b' i.e.. Isoleucine o Branched chain amino acids are leucine, Isoleucine and valine.Leucine is purely ketogenic.Isoleucine is both ketogenic and glucogenic.Valine is glucogenic.