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1. Christmas disease develops due to deficiency of clotting factor :
- A. VII
- B. VII
- C. VII
- D. VII
Answer: Option B
Explanation:
It is caused by a deficiency of a blood plasma protein called factor IX. Without enough factor IX, the blood cannot clot properly to control bleeding. There are several types of hemophilias, including hemophilia A and B. Hemophilia A is 7 times more common than hemophilia B.
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