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
Caisson's disease 
Select and explain. 
A. Gas embolism, B. Amniotic fluid embolism, C. Tumor embolism, D. Air embolism
A: Gas embolism
Answer: A: Gas embolism 
Explanation: A i.e. Gas embolism