Thiamine deficiency causes decreased energy production because:

• A. It is a co-enzyme for transketolase in pentose phosphate pathway
• B. It is a co-enzyme for pyruvate dehydrogenase and ALFA - ketoglutarate dehydrogenase in Tricarboxylic acid pathway.
• C. It is required for the process of transamination
• D. It is a co-factor for oxidative reduction