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
Thiamine deficiency causes decreased energy production because? 
Select and explain. 
A. It is required for the process of transamination, B. It is co-factor in oxidative reduction, C. It is co-enzyme for transketolase in pentose phosphate pathway, D. It is co-enzyme for pyruvate dehydrogenase
D: It is co-enzyme for pyruvate dehydrogenase
Answer: D: It is co-enzyme for pyruvate dehydrogenase 
Explanation: None