This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal  disorders, Subject name: Pediatrics
Duchenne&;s Muscular Dystrophy is a disease of 
Select and explain. 
A. Neuromuscular junction, B. Sarcolemmal proteins, C. Muscle contractile proteins, D. Disuse atrophy due to muscle weakness
C: Muscle contractile proteins
Answer: C: Muscle contractile proteins 
Explanation: Duchenne and Becker muscular dystrophy are caused by loss-of-function mutations in the dystrophin gene on the X chromosome. The encoded protein, dystrophin, is a key component of the dystrophin-glycoprotein complex.Dystrophin is thought to provide mechanical stability to the myofiber and its cell membrane during muscle contraction.Robbins 9e 1242