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
Enzyme deficiency in glycogen storage disease type 5 is: 
Select and explain. 
A. Glucose 6 phosphatase, B. Acid maltase, C. De branching enzyme, D. Myophpsphorylase deficiency
D: Myophpsphorylase deficiency
Answer: D: Myophpsphorylase deficiency 
Explanation: D Harper, 26,h ed, p. 152, Table (18.2) & 25th ed, p. 206, Table (20.2)