<prompt> The co-factor for glycogen phosphorylase in glycogenolysis is:Thiamine pyrophosphatePyridoxal phosphateCitrateFAD  <response>: Glycogen phosphorylase catalyses the rate limiting step in glycogenolysis by catalyzing the phosphorolytic cleavage of glycogen to yield glucose 1-phosphate. Glycogen phosphorylase requires pyridoxal phosphate as its coenzyme. 