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
Which of the following is not a co-factor for pyruvate dehydrogenase complex? 
Select and explain. 
A. Thiamine pyrophosphate, B. FAD, C. NAD, D. Biotin
D: Biotin
Answer: D: Biotin 
Explanation: Co-factor for PDH complex are:
Thiamine pyrophosphate (vit B1), FAD (vit B2), NAD (vit B3), coA (vit B5), Lipoic acid.