Task: Question Answering
Input (English): Question: One of the enzymes mentioned below does not intervene in glycogen metabolism: 
 Options:  <1> Glycogen synthase. <2> Glycogen phosphorylase. <3> Glucose-6-phosphate dehydrogenase. <4> Phosphoglucomutase <5> UDP-glucose pyrophosphorylase.
Output (English): 3