A) haemophilia-B
B) hepatitis-B
C) Downs syndrome
D) sleeping sickness
Correct Answer: A
Solution :
Christmas disease is another name for hemophilia-B, which is one type of hemophilia. It is a coagulation disorder characterised by a deficiency in factor IX (plasma thromboplastin component or antihaemophilic factor-B) resulting in a bleeding diathesis. It is a genetic defect.
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