Which of the following disesase is sex linked?

Options

A. Colour blindness
B. Malignancy
C. Hepatitis
D. Leukemia

Answer

To determine which of the following diseases is sex-linked, we will analyze each option provided:

1. **Colorblindness**: This is a genetic condition that affects the ability to perceive colors accurately. It is caused by mutations in genes located on the X chromosome. Since males have only one X chromosome (XY), they are more likely to express colorblindness if they inherit the affected X chromosome. Therefore, colorblindness is a sex-linked disease.

2. **Malignancy**: This term refers to cancerous growths that arise from the uncontrolled division of abnormal cells in the body. Malignancy is not specifically linked to sex chromosomes and can affect both males and females equally. Thus, it is not a sex-linked disease.

3. **Hepatitis**: This is an inflammation of the liver that can be caused by viral infections, toxins, or autoimmune diseases. Hepatitis is not linked to sex chromosomes and can affect individuals regardless of their sex. Therefore, it is not a sex-linked disease.

4. **Leukemia**: This is a type of cancer that affects the blood and bone marrow. Like malignancy, leukemia is not specifically linked to sex chromosomes and can occur in both males and females. Thus, it is not a sex-linked disease.

Based on the analysis above, the only disease that is sex-linked is **colorblindness**.

**Final Answer**: The disease that is sex-linked is **colorblindness** (Option 1).