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
McArdle's disease is due to deficiency of ? 
Select and explain. 
A. Branching enzyme, B. Glucose 6 phosphatase, C. Acid maltase deficiency, D. Muscle phosphorylase
D: Muscle phosphorylase
Answer: D: Muscle phosphorylase 
Explanation: Muscle phosphorylase [Ref Harper 250/e p. 181Type Enzyme deficiencyOrgan (s) affected von Gierke's diseaseGlucose 6-phosphataseLiver, kidneyIIPompe's diseasea (1 4) Glucosidase (acid maltase)All organsIIICori's disease/Forbe's diseaseDebranching enzymeMuscle, liverIVAndersen's diseaseBranching enzymeLiver, myocardiumVMcArdle's diseasePhosphorylaseMuscleVIHers' diseasePhosphorylaseLiverVIITarui's diseasePhosphofructokinaseMuscle, RBCsVIII Phosphorylase kinaseLiverThere is also on X-linked form of phosphorylase kinase deficiency. This is sole exception as all other glycogen storage diseases are inherited as autosomal recessive trait.