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': 'Pyruvate can be converted directly into all the following except \nSelect and explain. \nA. Phosphoenol pyruvate, B. Alanine, C. Acetyl CoA, D. Lactate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Phosphoenolpyruvate\xa0\n\nWhile phosphoenol pyruvate can be directly converted to pyruvate (Glycolysis).\nPyruvate cannot be directly converted to phosphoenolpyruvate (Gluconeogenesis).\nConversion of phosphoenolpyruvate to pyruvate is an irreversible step in glycolysis, and is one of the barriers, in simple reversal of glycolysis.\nTo form phosphoenolpyruvate from pyruvate (Gluconeogenesis) pyruvate has to be first converted to oxaloacetate which is then converted to phosphoenolpyruvate by enzyme phosphoenolpyruvate carboxykinase.\nPyruvate can directly be converted to - Oxaloacetate, acetyl CoA, lactate, malate, alanine, and in yeasts and some bacteria to ethanol (by alcohol fermentation).', 'role': 'assistant'}]