Christmas disease is another name of

Options

A. Turner syndrome
B. Down's syndrome
C. Haemosphilia B
D. Haemophiliac

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the alternative name of "Christmas disease."

2. **Identifying the Options**: The options provided are:
- Turner syndrome
- Down syndrome
- Haemophilia B
- Haemophilia

3. **Researching Christmas Disease**: Christmas disease is known in the medical community as Haemophilia B.

4. **Explaining Haemophilia B**: Haemophilia B is a genetic disorder caused by a deficiency of a specific blood clotting factor, which is known as factor IX (9). This factor is also referred to as the "Christmas factor" because it was first identified in a patient named Stephen Christmas in the 20th century.

5. **Evaluating the Options**:
- **Turner syndrome**: This is a condition where a female is born with only one X chromosome, making this option incorrect.
- **Down syndrome**: This condition is characterized by an extra copy of the 21st chromosome, which also makes this option incorrect.
- **Haemophilia B**: This is indeed known as Christmas disease, making this option correct.
- **Haemophilia**: This term refers generally to blood clotting disorders and does not specifically identify Christmas disease, making this option incorrect.

6. **Conclusion**: The correct answer to the question "Christmas disease is another name of" is **Haemophilia B**.

---