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: Pharmacology
Which of the following muscle relaxant is contraindicated in muscle dystrophy? 
Select and explain. 
A. Quinine, B. Succinyl choline, C. Dantrolene, D. All of the above
B: Succinyl choline
Answer: B: Succinyl choline 
Explanation: Succinyl choline can cause hyperkalemia in especially in nerve & muscle disorders. Hence it is avoided in patients with paraplegia, Guillain barre syndrome, Myasthenia gravis & muscle dystrophy.