Which of the following is used in the treatment of cancer

Options

A. X - rays
B. UV - rays
C. `gamma`-rays
D. Both (1) and (3)

Answer

To determine which of the following is used in the treatment of cancer, let's analyze the options provided:

1. **X-rays**
2. **UV rays**
3. **Gamma rays**
4. **Both X-rays and Gamma rays**

### Step-by-Step Solution:

**Step 1: Understanding Cancer Treatment Methods**
- Cancer treatment often involves methods like surgery, chemotherapy, and radiotherapy. Radiotherapy uses high-energy radiation to kill cancer cells.

**Step 2: Identifying the Types of Radiation**
- The types of radiation commonly used in radiotherapy include X-rays and gamma rays. Both of these are forms of high-energy electromagnetic radiation.

**Step 3: Evaluating Each Option**
- **X-rays**: These are indeed used in radiotherapy to target and kill cancer cells.
- **UV rays**: While UV rays can cause skin cancer, they are not used in the treatment of cancer. In fact, they are associated with increasing the risk of cancer.
- **Gamma rays**: Like X-rays, gamma rays are also used in the treatment of cancer due to their high energy and ability to penetrate tissues.
- **Both X-rays and Gamma rays**: Since both types of rays are used in cancer treatment, this option is correct.

**Step 4: Conclusion**
- The correct answer is option 4: Both X-rays and Gamma rays are used in the treatment of cancer.

### Final Answer:
**Option 4: Both X-rays and Gamma rays**

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