Christmas disease is another name for

Christmas disease is another name for
  1. haemophilia B
  2. hepatitis B
  3. Down's syndrome
  4. sleeping sickness

Solution

Christmas disease, also called haemophilia B or factor IX haemophilia is a genetic disorder caused by missing or defective factor $\mathrm{IX}$, a clotting protein. Haemophilia $\mathrm{A}$ is caused by a lack of the blood clotting factor VIII.

Asked in: NEET 2003

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