Which of the following. discases is also called Christmas disease?

Options

A. sickle-cell anaemia
B. haemoglobinuria
C. myocardial infaraction
D. haemophilia -B

Explanation

To solve the question "Which of the following diseases is also called Christmas disease?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- Sickle Cell Anemia
- Hemoglobinuria
- Myocardial Infarction
- Hemophilia B

2. **Understand the Terms**:
- **Sickle Cell Anemia**: A genetic disorder that causes red blood cells to become misshapen (sickle-shaped), leading to various complications.
- **Hemoglobinuria**: A condition characterized by the presence of hemoglobin in the urine, often due to hemolysis.
- **Myocardial Infarction**: Commonly known as a heart attack, it occurs when blood flow to a part of the heart is blocked.
- **Hemophilia B**: A genetic disorder caused by a deficiency of clotting factor IX, leading to excessive bleeding.

3. **Research the Nickname**:
- Hemophilia B is known as Christmas disease because it was first identified in a patient named Stephen Christmas. The term "Christmas factor" refers to factor IX, which is deficient in this condition.

4. **Analyze Each Option**:
- **Sickle Cell Anemia**: Not related to Christmas disease.
- **Hemoglobinuria**: Not related to Christmas disease.
- **Myocardial Infarction**: Not related to Christmas disease.
- **Hemophilia B**: Correctly identified as Christmas disease.

5. **Conclusion**: The disease that is also called Christmas disease is **Hemophilia B**.

### Final Answer:
**Hemophilia B**

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