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
EMG is least useful for diagnosis of 
Select and explain. 
A. Cerebral palsy, B. Spinal muscular atrophy, C. Charot-Marie-Tooth disease, D. Myasthenia gravis
A: Cerebral palsy
Answer: A: Cerebral palsy 
Explanation: EMG is leastly used in cerebral palsy since the cause is in the brain and not in the muscles