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
All of the following require pyridoxine as a co-factor except? 
Select and explain. 
A. ALA synthase, B. Transamination, C. Glycogen phosphorylase, D. Transketolase
D: Transketolase
Answer: D: Transketolase 
Explanation: Pyridoxal phosphate (PLP) is a coenzyme for enzymes involved in the following raections: Transamination Decarboxylation Glycogen phosphorylase Cystathionine b-synthase and cystathioninase ALA synthase Kynureninase Thiamine is the coenzyme for transketolase reactions Reference: Harpers illustrated biochemistry 30th edition