This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
Pyridoxine in required as co-factor in all, except 
Select and explain. 
A. Transamination, B. Transketolation, C. Glycogen phosphonylase, D. Decarboxylation
B: Transketolation
Answer: B: Transketolation 
Explanation: PLP is closely associated with the metabolism of amino acids. Pyridoxal phosphate paicipates in reactions like transamination, decarboxylation, deamination, transsulfuration, condensation etc. Transketolase: The second group of enzymes that use TPP as co-enzyme are the transketolases, in the hexose monophosphate shunt pathway of glucose. This reaction is possible with TPP Ref: Satyanarayana 4th ed page 377