Question

Christmas disease is another name for

• A. Haemophilia B
• B. Hepatitis B
• C. Down's syndrome
• D. Sleeping sickness

Answer 1

The correct option is A Haemophilia B

Haemophilia B is a blood clotting disorder, caused by a mutation of the factor IX gene, leading to a deficiency of factor IX. It is the second most common form of haemophilia. It is sometimes called Christmas disease, named after Stephen Christmas, the first patient described with this disease. So, the correct answer is option A.