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
Both glucogenic and ketogenic amino-acids are all except - 
Select and explain. 
A. Phenylalanine, B. Tyrosine, C. Tryptophan, D. Leucine
D: Leucine
Answer: D: Leucine 
Explanation: Ans. is 'd' i.e., Leucine