This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculo Skeletal Disorders, Subject name: Pediatrics
This sign is seen in all the following disorders EXCEPT? 
Select and explain. 
A. Duchenne muscular dystrophy, B. Becker's muscular dystrophy, C. Landouzy-Dejerine disease, D. Spinal muscular atrophy
D: Spinal muscular atrophy
Answer: D: Spinal muscular atrophy 
Explanation: d. Spinal muscular atrophyThe given picture shows a child using his upper limb to help him get up from sitting position; This is called 'Gower sign'