## **Core Concept**
Caisson's disease, also known as decompression sickness, is a condition that occurs when rapid changes in pressure cause gas bubbles to form in the bloodstream and tissues. This condition is commonly seen in divers who surface too quickly, but it can also occur in workers who experience rapid decompression in high-pressure environments.

## **Why the Correct Answer is Right**
The correct answer, , is related to the formation of gas bubbles in the bloodstream and tissues due to rapid decompression. When an individual is exposed to high pressure, gases in the body are dissolved in the blood and tissues. If the pressure decreases too rapidly, these dissolved gases can form bubbles, leading to decompression sickness. This process involves **physical laws** such as **Henry's Law**, which describes the relationship between the amount of dissolved gas in a liquid and the partial pressure of that gas above the liquid.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option is incorrect because while gas bubbles do form, the primary issue in Caisson's disease is not the direct effect of carbon dioxide but rather the formation of nitrogen bubbles due to rapid decompression.
* **Option B:** - This option is incorrect because the condition is specifically related to decompression and not to carbon monoxide poisoning, which is a different condition caused by inhaling carbon monoxide gas.
* **Option C:** - Although not listed, any other option suggesting a different mechanism such as infection or direct toxic effect would be incorrect because Caisson's disease is specifically related to physical changes in pressure.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **prevention** of Caisson's disease involves gradual decompression to allow gases to safely exit the body. Treatment often involves **recompression** in a hyperbaric chamber to reduce bubble size, followed by gradual decompression.

## **Correct Answer:** .