This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
Laudanosine is a metabolite of - 
Select and explain. 
A. Mivacurium, B. Atracurium, C. Pancuronium, D. Gantacurium
B: Atracurium
Answer: B: Atracurium 
Explanation: Ans. is 'b' i.e., Atracurium Atracurium* It is a bisquarternary competitive blocker, 4 times less potent than pancuronium.* Unique feature is its inactivation in plasma by spontaneous non - enzymatic degradation called as Hoffman elimination.Following degradation it produces a metabolite - laudanosine.* Metabolite Laudanosine may induce seizures in some patients.