Which of the following is a histopathological examination ?

Options

A. Computed tomography
B. MRI
C. X-rays
D. Biopsy

Answer

To determine which of the following is a histopathological examination, we need to understand what histopathology is and analyze the given options.

### Step-by-Step Solution:

1. **Understand Histopathology**: Histopathology is the study of tissue abnormalities. It involves examining tissue samples under a microscope to identify any pathological changes.

**Hint**: Histopathology focuses on examining tissues for abnormalities.

2. **Evaluate the Options**:
- **Option 1: Computer Tomography (CT scan)**: This imaging technique uses X-rays to create detailed images of the body. It does not involve taking tissue samples for examination.

**Hint**: CT scans create images but do not involve tissue analysis.

- **Option 2: X-rays**: Similar to CT scans, X-rays provide images of the body but do not involve the removal of tissue for microscopic examination.

**Hint**: X-rays are also imaging techniques without tissue sampling.

- **Option 3: MRI (Magnetic Resonance Imaging)**: This method uses strong magnetic fields and radio waves to produce images of organs and tissues. Like the previous options, it does not involve tissue sampling.

**Hint**: MRI is another imaging technique that does not analyze tissue samples.

- **Option 4: Biopsy**: A biopsy involves the removal of a small amount of tissue from an organ or lesion, which is then examined microscopically for any abnormalities. This is the only option that fits the definition of a histopathological examination.

**Hint**: A biopsy is the only procedure that involves taking tissue for analysis.

3. **Conclusion**: The correct answer is **biopsy**, as it is the only option that involves the histopathological examination of tissue.

### Final Answer:
**Biopsy** is the histopathological examination.