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: Unknown
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: Ans. is 'd' i.e., Muscle phosphorylase Type Enzyme deficiencyOrgan (s) affected1von Gierke's diseaseGlucose 6-phosphataseLiver, kidney11Pompe's diseasea (1 - 4) Glucosidase (acid maltase)All organsIIICori's disease/Forbe's diseaseDebranching enzymeMuscle, liverIVAndersen's diseaseBranching enzymeLiver, myocardiumVMcArdle's diseaseMuscle PhosphorylaseMuscleVIHers' diseasePhosphorylaseLiverVIITarui's diseasePhosphofructokinaseMuscle, RBCsVIII Phosphorylase kinaseLivero There is also on X-ltnked form of phosphorylase kinase deficiency. This is sole exception as all other glycogen storage diseases are inherited as autosomal recessive trait.