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: Anaesthesia
[{'content': 'Which of the following muscle relaxants causes maximal pain on injection – \nSelect and explain. \nA. Succinyl choline, B. Vecuronium, C. Rocuronium, D. Cistracurium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pain during injection is an important and common feature of Rocuronium Injection.', 'role': 'assistant'}]