The best diagonsis of caner is done by

Options

A. Biopsy
B. X-ray
C. Microscopic examination of body fluids
D. surgery

Answer

### Step-by-Step Solution:

1. **Understanding Cancer Diagnosis**:
- Cancer diagnosis can be performed using various methods, each with its own advantages and limitations.

2. **Methods of Diagnosis**:
- **CT Scan**: A radiological method that provides detailed images of the body's internal structures.
- **MRI**: Uses powerful magnetic fields to create detailed images of organs and tissues.
- **Cancer Markers**: These are substances produced by cancer cells or by the body in response to cancer. They can be detected in the blood.
- **Genetic Testing**: This method assesses genetic predispositions to certain types of cancer.
- **Ultrasound**: Useful for detecting cancers in organs such as the pancreas, kidney, and liver.
- **X-ray**: Often used to detect bone cancer.
- **Body Fluid Examination**: Involves analyzing fluids from the body to identify malignant cells.
- **Biopsy**: Involves the removal of a small tissue sample for examination under a microscope.

3. **Identifying the Best Method**:
- Among all these methods, the biopsy is considered the most definitive diagnostic tool for cancer. It allows for direct examination of tissue and can confirm the presence of cancer cells.

4. **Conclusion**:
- Therefore, the best diagnosis of cancer is done by **biopsy**.