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
Vitamin B1 is required for which reaction 
Select and explain. 
A. Transamination, B. Oxidative decarboxylation, C. Carboxylation, D. All of the above
B: Oxidative decarboxylation
Answer: B: Oxidative decarboxylation 
Explanation: Ans. is 'b' i.e.,Oxidative decarboxylation Active form (coenzyme form) of thiamine is thiamine pyrophosphate (TPP), also called thiamine diphosphate (TDP).TPP acts as coenzyme forOxidative decarboxylation:- Pyruvate dehydrogenase, a-ketoglutarate dehydrogenase, brached-chain keto acid dehydrogenase.Transketolase in PPP.