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
[{'content': 'Hemophilia B is due to deficiency of \nSelect and explain. \nA. Factor IX, B. Factor VII, C. Factor XI, D. Factor X', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hemophilia B is also known as Christmas disease\nDeficiency of factor 9 X linked recessive\n\n\n\nDisorder\nDeficiency\n\n\nHemophilia A\n\t\t\t\u200bHemophilia B\n\t\t\tHemophilia C\nFactor 8\n\t\t\tFactor 9\n\t\t\tFactor 11', 'role': 'assistant'}]