Which of the following is not used for treating cancer

Options

A. `""^(131)I`
B. `""^(60)Co`
C. Taxol
D. Streptokinase

Answer

To determine which of the following options is not used for treating cancer, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Cancer Treatment**:
- Cancer is typically treated using various methods, including chemotherapy, radiation therapy, and targeted therapies. Many of these treatments involve the use of radioactive isotopes.

2. **Analyzing the Options**:
- We need to look at each option provided in the question to see if they are related to cancer treatment.

3. **Identifying Isotopes**:
- Options 1, 2, and 3 are likely to be isotopes (radioactive elements) that are used in cancer treatment. These isotopes can help in targeting and destroying cancer cells.

4. **Identifying Non-Cancer Treatment**:
- The remaining option is streptokinase. Streptokinase is an enzyme that is primarily used to dissolve blood clots in patients who have suffered a heart attack.

5. **Conclusion**:
- Since streptokinase is used for treating heart attacks and not cancer, it is the correct answer to the question.

### Final Answer:
**Streptokinase is not used for treating cancer.**