This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
[{'content': 'A male patient came with pain in calf muscles in exercise. On biopsy glycogen present in the muscle. What is the enzyme eficiency? \nSelect and explain. \nA. Branching enzyme, B. Phosphofructokinase I, C. Debranching enzyme, D. Glucose 6 phosphatase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Phosphofructokinase INB: If Muscle phosphorylase is there then its the best answer/as McArdles is MC GSD in adolescent age. if its not there then PFK-1 is the answer', 'role': 'assistant'}]