<prompt> A male patient came with pain in calf muscles in exercise. On biopsy glycogen present in the muscle. What is the enzyme eficiency?Branching enzymePhosphofructokinase IDebranching enzymeGlucose 6 phosphatase  <response>: Ans. B. Phosphofructokinase INB: If Muscle phosphorylase is there then its the best answeras McArdles is MC GSD in adolescent age. if its not there then PFK-1 is the answer 