A 3 Year Old Child Was Having Difficulty Walking

Multiple Choice

A 3 year old child was having difficulty walking.He had not met his developmental milestones.His legs actually looked quite strong,with apparently muscular calves.However,the paediatric neurologist ordered a muscle biopsy,which is shown in the accompanying photomicrograph.On the right is an immunohistochemical stain for dystrophin protein.

A) Becker muscular dystrophy
B) Duchenne muscular dystrophy
C) Mitochondrial myopathy
D) Neurogenic muscular atrophy
E) Polymyositis