This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Hemophilia B is due to deficiency of 
Select and explain. 
A. Factor IX, B. Factor VII, C. Factor XI, D. Factor X
A: Factor IX
Answer: A: Factor IX 
Explanation: Hemophilia B is also known as Christmas disease
Deficiency of factor 9 X linked recessive



Disorder
Deficiency


Hemophilia A
			​Hemophilia B
			Hemophilia C
Factor 8
			Factor 9
			Factor 11