Which of the following pollutant accumulates in the bones, replaces calcium and may cause bone cancer?

Options

A. Strontium - 90
B. CO
C. `NO_(x)`
D. SPM

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which pollutant accumulates in the bones, replaces calcium, and may cause bone cancer.

2. **Analyzing the Options**: The options provided are:
- A) Strontium-90
- B) Carbon monoxide
- C) Nitrogen oxide
- D) Suspended particulate matter (SPM)

3. **Identifying the Correct Pollutant**:
- **Strontium-90**: This is a radioactive isotope of strontium produced by nuclear fission. It is known to behave similarly to calcium in the body, which allows it to accumulate in bones.
- **Carbon monoxide**: This is a gas that primarily affects the respiratory system and does not accumulate in bones.
- **Nitrogen oxide**: This is primarily an air pollutant that affects the respiratory system and does not accumulate in bones.
- **Suspended particulate matter (SPM)**: This refers to tiny particles in the air that can cause respiratory issues but do not specifically accumulate in bones.

4. **Conclusion**: Strontium-90 is the only pollutant that accumulates in bones, replaces calcium, and has been linked to bone cancer and other health issues like leukemia.

5. **Final Answer**: The correct answer is **A) Strontium-90**.