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
Which one of the following skeletal muscle relaxants cause pain on injection 
Select and explain. 
A. Succinylcholine, B. Vecuronium, C. Rocuronium, D. Pancuronium
C: Rocuronium
Answer: C: Rocuronium 
Explanation: Refer Pharmacology for Nurse Anaesthesiology /110 Rocuronium causes pain on injection Propofol is also responsible for pain on injection Remember post operative muscular pain is caused by succinylcholine and post operative muscle rigidity is caused by Fentanyl group of drugs