The disease as a result of prolonged clotting time is due to the lack of plasma thromboplastin component necessary to the formation of thromboplastin, is
A
Christmas disease
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B
Hypoprothrombinemia
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C
Haemophilia
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D
Stuart disease
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Solution
The correct option is A Christmas disease The Christmas disease is nothing but the Haemophilia B. It is a blood clotting disorder caused by a mutation of the factor IX gene, leading to a deficiency of factor IX . It is called as Christmas disease, as it is named after Stephen Christmas, the first patient described with this disease. Therefore, the correct answer is option A.