This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
A patient is allergic to succinylcholine; the muscle relaxant of choice for this patient is? 
Select and explain. 
A. Atracurium, B. Rocuronium, C. Doxacuronium, D. Pipecuronium
B: Rocuronium
Answer: B: Rocuronium 
Explanation: None