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AIPMTAIPMT 2003Human Health and Disease
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Solution:
Haemophilia B, a type of haemophilia is also known as Christmas disease. It is due to deficiency of a blood coagulation factor, the Christmas factor (factor IX). Christmas was the person (20th century) in whom the factor was first identified. Haemophilia B is a defect of the blood which prevents its clotting.