This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, 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: Substrates for gluconeognesis Lactate All amino acids except leucine and lysine Pyruvate Propionate Glycerol Intermediates of citric acid cycle Alanine is the most impoant gluconeogenic amino acid. REF: Lippincott book of biochemistry 6th ed.