This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acids Basics, Subject name: Biochemistry
Which of the following amino acids is purely ketogenic- 
Select and explain. 
A. Phenylalanine, B. Leucine, C. Proline, D. Tyrosine
B: Leucine
Answer: B: Leucine 
Explanation: Ans. is 'b' i.e., Leucine GlucogenicKetogenicBoth glucogenic & ketogenico Alanineo Arginineo Aspargineo Aspartic acido Cysteineo Glutamineo Glutamic acido Glycineo Histidineo Methionineo Prolineo Serineo Threonineo Valineo Leucineo Lysineo Isoleucineo Phenylalaineo Tyrosino TryptophanNote : According to Harper 29(r)/e (P-282), lysine is both ketogenic and glucogenic. But all other textbooks have mentioned it as ketogenic.