Which of the following disease is also known as factor IX deficiency, or Christmas disease?

Which of the following disease is also known as factor IX deficiency, or Christmas disease?
[A]Haemophilia A
[B]Haemophilia B
[C]Hepatitis B
[D]Hepatitis C

Haemophilia B
Haemophilia B is the second most common type of haemophilia. It can also be known as factor IX deficiency, or Christmas disease. It was originally named “Christmas disease” for the first person diagnosed with the disorder back in 1952.

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