This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Medicine
Christmas disease is treated by 
Select and explain. 
A. Fresh frozen plasma, B. Fresh frozen blood, C. Cryoprecipitate, D. Steroids
A: Fresh frozen plasma
Answer: A: Fresh frozen plasma 
Explanation: Fresh frozen contains all the coagulation factors except platelets. Also erythrocytes and leukocytes are absent in it. The specific treatment is with factor9 concentrate. The new extended half life recombinant factor 9 products made by Fc fusion, albumin fusion and pegylation offer the possibility of prophylaxis on a once-weekly or even two-weekly schedule. Reference : Davidson, 23rd Edition, page no : 974.