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
[{'content': 'Which one of the following skeletal muscle relaxants causes pain on injection? \nSelect and explain. \nA. Succinyl choline, B. Vecuronium, C. Rocuronium, D. Pancuronium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Rocuronium causes pain on injection. It can be minimized by alkalinizing the solution. Remember, post-operative muscular pain is caused by succinylcholine', 'role': 'assistant'}]