This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inborn Errors of Metabolism, Subject name: Pediatrics
[{'content': 'Which glycogen storage disease does not affect muscles? \nSelect and explain. \nA. Type 1, B. Type 2, C. Type 3, D. Type 4', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Type 1(Ref: Nelson's 20/e p 715-725, Ghai 8/e p 655-657)Type 2 Pompe disease predominantly involves muscles, while type I GSD involves liver.Although type 2 and type 3 GSD are predominantly liver glycogenoses, skeletal muscle involvement may also be seen.", 'role': 'assistant'}]