Bone cancer is caused by

Options

A. Iodine 127
B. Strontium 90
C. Cesium 137
D. None of these

Answer

**Step-by-Step Text Solution:**

1. **Understanding Bone Cancer**: Bone cancer, specifically osteosarcoma, is a type of cancer that originates in the bone. It primarily affects younger individuals, typically between the ages of 10 to 25.

2. **Identifying Causes**: Bone cancer can be caused by various factors, including genetic predisposition and exposure to certain environmental elements. One significant environmental factor is exposure to radioactive materials.

3. **Radioactive Elements**: Among the radioactive elements listed in the question, we have iodine-127, strontium-90, and cesium-137. It is important to assess which of these elements is linked to bone cancer.

4. **Analyzing the Elements**:
- **Iodine-127**: This isotope is primarily used in medical applications, particularly in thyroid treatments, and is not associated with bone cancer.
- **Strontium-90**: This is a radioactive isotope that can accumulate in bones. It is known to be linked to increased risks of bone cancer due to its ability to mimic calcium and deposit in bone tissue.
- **Cesium-137**: While this isotope is radioactive, it is not specifically known for causing bone cancer.

5. **Conclusion**: Based on the analysis, strontium-90 is the most relevant radioactive element associated with the development of bone cancer, particularly osteosarcoma.

6. **Final Answer**: Therefore, the correct answer to the question "Bone cancer is caused by" is **strontium-90**.

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