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': 'For which of the following enzymes, thiamine pyrophosphate (TPP) acts as Cofactor \nSelect and explain. \nA. Pyruvate Dehydrogenase, B. Alpha Ketoglutarate dehydrogenase, C. Branched chain ketoacid dehydrogenase, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]