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
Muscle relaxant of choice in renal and hepatic failure is: 
Select and explain. 
A. Cis-atracurium, B. Vecuronium, C. Rocuronium, D. Rapacuronium
A: Cis-atracurium
Answer: A: Cis-atracurium 
Explanation: Ans. (A) Cis-atracurium(Ref: Katzung 9th/e p432; KDT 8th/e p380)Atracurium and cis-atracurium are muscle relaxants of choice for renal and hepatic failure patients.