This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Carbohydrate Metabolism, Subject name: Pediatrics
Hers disease is due to deficiency of: 
Select and explain. 
A. Liver phosphorylase, B. Muscle phosphorylase, C. Branching enzyme, D. RBC phosphofructokinase
A: Liver phosphorylase
Answer: A: Liver phosphorylase 
Explanation: Hers disease:due to deficiency of liver phosphorylase benign course and present with hepatomegaly and growth retardation in early childhood; Hypoglycemia, hyperlipidemia, and hyperketosis of variable severity are seen.