Task: Question Answering
Input (English): Question: Thiamine pyrophosphate (PPT) is not coenzyme of: 
 Options:  <1> Pyruvate dehydrogenase (synthesis of acetyl CoA). <2> Alpha-ketoglutarate dehydrogenase (citric acid cycle). <3> Transketolase (pentose phosphate pathway). <4> Transaldolase (pentose phosphate route). <5> Pyruvate decarboxylase (ethanolic fermentation).
Output (English): 4