This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscle relaxants, Subject name: Anaesthesia
A 6 year old boy taken for ophthalmic examination under anaesthesia. His father told that he has lower limb weakness & his elder brother died at 14 years of age. Which anaesthetic drug has to be avoided. 
Select and explain. 
A. Succinylcholine, B. Pancuronium, C. Atracurium, D. Dexacurium
A: Succinylcholine
Answer: A: Succinylcholine 
Explanation: ROLE OF SUCCINYLCHOLINE ON MUSCLES * Succinylcholine, commonly used in anesthesia, paralyzes normal skeletal muscles by blocking transmission at the myoneural junction