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