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A 60-year-old man with recurrent bacterial sepsis is hospitalized in order to receive intravenous antibiotics. He is started on his fourth course of broad-spectrum antibiotics within the past month. Three days into the admission, his nurse notes that his venous access is oozing blood. Laboratory tests reveal a prolonged prothrombin time, a prolonged partial thromboplastin time, and a normal platelet count. Which of the following coagulation cofactors would be deficient first in this patient?
A. Factor II
B. Factor V
C. Factor VII
D. Factor VIII
E. Factor XI
F. Factor XII
A. Factor II
B. Factor V
C. Factor VII
D. Factor VIII
E. Factor XI
F. Factor XII