This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuromuscular Blocker, Subject name: Anaesthesia
A boy undergoes eye surgery under day care anesthesia with succinyl choline and propofol and after 8 hours he stas walking and develops muscle pain. What is the cause? 
Select and explain. 
A. Early mobilization, B. Due to the effects of eye surgery, C. Succinyl choline, D. Propofol
C: Succinyl choline
Answer: C: Succinyl choline 
Explanation: This is most probably postoperative myalgia associated with succinyl choline. Myalgia: Postoperative skeletal muscle pain, which is paicularly prominent in the skeletal muscles of the neck, side and abdomen can occur. Most possible cause unsynchronized contraction of skeletal muscle (fasciculation).