This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
Laudanosine is a metabolite of 
Select and explain. 
A. Atracurium, B. Cis Atracurium, C. Pancuronium, D. Vecuronium
A: Atracurium
Answer: A: Atracurium 
Explanation: Refer Miller 7/e p 880 Both Atracurium and cis-Atracurium are eliminated by Hoffman's elimination Atracurium is also metabolized by liver to some extent and result in production of a metabolite laudanosine that can cause CNS toxicity including seizures