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: Biochemistry
Not a substrate for gluconeogenesis - 
Select and explain. 
A. Glycerol, B. Leucine, C. Lactate, D. Propionate
B: Leucine
Answer: B: Leucine 
Explanation: Ans. is 'b' i.e., LeucineSubstrates for gluconeognesis ?LactateAll amino acids except leucine and lysinePyruvate PropionateGlycerolIntermediates of citric acid cycleAlanine is the most impoant gluconeogenic amino acid.