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 of the following is not a co-factor for pyruvate dehydrogenase complex \nSelect and explain. \nA. Thiamine pyrophosphate, B. FAD, C. NAD, D. Biotin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cofactor for PDH complex are:\nThiamine pyrophosphate (Vit B1), FAD (Vit B2), NAD (Vit B3), CoA (Vit B5), Lipoic acid.', 'role': 'assistant'}]