This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Which is not a substrate for gluconeogenesis? 
Select and explain. 
A. Alanine, B. Fatty acid, C. Pyruvate, D. Lactate
B: Fatty acid
Answer: B: Fatty acid 
Explanation: Substrate for gluconeogenesis are: -glucogenic amino acids, lactate, glycerol, propionyl CoA Glucose cannot be produced from fatty acidRef: DM Vasudevan, 7th edition, page no: 120