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
Gluconeogenesis can occur from all except 
Select and explain. 
A. Lactic acid, B. Aceto acetate, C. Glycerol, D. Alanine
B: Aceto acetate
Answer: B: Aceto acetate 
Explanation: Substrates for gluconeogenesis are lactate (lactic acid), pyruvate, glycerol, glucogenic amino acids (all amino acids except leucine and lycine), propionate and intermediates of the citric acid cycle.