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: Physiology
[{'content': "Caisson's disease \nSelect and explain. \nA. Gas embolism, B. Amniotic fluid embolism, C. Tumor embolism, D. Air embolism", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Gas embolism', 'role': 'assistant'}]