This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': "Muscle phosphorylase deficiency leads to which glycogen storage disorder? \nSelect and explain. \nA. Her's disease, B. McArdle's disease, C. Cori's disease, D. Andersen disease", 'role': 'user'}, {'content': "Answer: B \nExplanation: Muscle phosphorylase deficiency leads to Mc Ardle's disease.  which is characterised by poor exercise tolerance, muscle glycogen being abnormally high and blood lactate level very low after exercise.\nMnemonic\n\nHer's disease - Hepatic phorphorylase\nAndersen disease - Branching enzyme\nCori's disease - Debranching enzyme.\n\nMnemonic A for B, C for D", 'role': 'assistant'}]