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
[{'content': 'Gluconeogenesis can occur from all except \nSelect and explain. \nA. Lactic acid, B. Aceto acetate, C. Glycerol, D. Alanine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]