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
Decompression sickness is seen ina) Diverb)  Pilotc)  Mountaineerd)  Long distance drivers 
Select and explain. 
A. ab, B. ac, C. bc, D. cd
A: ab
Answer: A: ab 
Explanation: Sudden decrease in atmospheric pressure results in gas embolism. This is seen in sudden ascent in aircraft, sudden ascent from deep sea etc. This is known as Caisson’s disease or decompression sickness.