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': 'Which one of the following enzymes provides a link between glycolysis and the citric acid cycle? \nSelect and explain. \nA. Lactate dehydrogenase, B. Pyruvate Kinase, C. Citrate synthase, D. Pyruvate dehydrogenase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: PDH complex consist of 3 Enzymes and 5 Coenzymes\nThree enzymes are:\n\nPyruvate Dehydrogenase bound to Thiamin Diphosphate\nDihydrolipoyl Transacetylase, the prosthetic group is oxidised Lipomide\nDihydrolipoyl\xa0 Dehydrogenase, contains FAD.\n\nCoenzymes (very important)\n\nThiamine Diphosphate (TDP)\nLipomide\nCoenzyme A\nFAD\nNAD\n\nKey Concept:\n\xa0Pyruvate Dehydrogenase\xa0 which converts pyruvate to acetyl CoA provides a connecting link between\xa0glycolysis and citric acid cycle.', 'role': 'assistant'}]