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 one of the common side effects is seen with fentanyl ? \nSelect and explain. \nA. Chest wall rigidly, B. Tachycardia, C. Pain in abdomen, D. Hypertension', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]