Decompression sickness occurs in

Options

A. person living on high altitude
B. Person who smokes heavily
C. A diver who has been beneath the sea for a long period
D. Person whose alveoli are acutely inflamed.

Answer

### Step-by-Step Solution:

1. **Understanding Decompression Sickness**:
- Decompression sickness, also known as "the bends," occurs when a person experiences a rapid decrease in pressure, typically after being in a high-pressure environment such as underwater.

2. **Identifying the Causes**:
- The condition is primarily associated with divers who ascend too quickly from deep water, leading to the formation of nitrogen bubbles in the bloodstream.

3. **Analyzing the Options**:
- **Option 1**: A person living at high altitude.
- This option is incorrect because decompression sickness is related to rapid changes in pressure, not sustained high altitude.
- **Option 2**: A person who smokes heavily.
- This option is also incorrect as smoking does not directly relate to decompression sickness.
- **Option 3**: A diver who has been in the sea for a long period.
- This option is correct because divers are at risk of decompression sickness if they ascend too quickly after being at depths for extended periods.
- **Option 4**: A person whose alveoli are acutely inflamed.
- This option is incorrect as inflammation of the alveoli does not cause decompression sickness.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is **Option 3: A diver who has been in the sea for a long period**.