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
[{'content': 'Pyruvate dehydrogenase complex contains all except \nSelect and explain. \nA. Biotin, B. NAD, C. FAD, D. CoA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pyruvate dehydrogenase complex--thiamin diphosphate, lipoate, NAD+, FAD, and CoA Reference: Harper; 30th edition; Page no: 163', 'role': 'assistant'}]