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
Enzyme transketolase is dependent on which of the following co-enzymes? 
Select and explain. 
A. NAD, B. FAD, C. CoA, D. TPP
D: TPP
Answer: D: TPP 
Explanation: (Thiamine pyrophosphate) Therefore, measurement of erythrocyte transketolase activity gives idea regarding thiamine status of the body.