This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding Disorders, Subject name: Pathology
[{'content': 'Factor IX deficiency results in increased - \nSelect and explain. \nA. PT (Prothrombin Time), B. PTT (Partial thromboplastin time), C. BT (Bleeding Time), D. TT (Thrombin time)', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., PTT (Partial thromboplastin time) o Partial thromboplastin time (PTT): It tests the intrinsic and common coagulation pathways. So, a prolonged PTT can results from deficiency of factor V, VIII (factor VIIIc, Von willebrand factor), IX, X, XI, XII, prothrombin or fibrinogen.o Prothrombin time (PT): It tests the extrinsic and common coagulation pathways. So, a prolonged PT can results from deficiency offactor V, VII, X, prothrombin or fibrinogen.# Thus in common coagulation pathway defect both PT and PTT are elevatedo Activated clotting time (clotting time): It also tests the intrinsic and common coagulation system. So it is prolonged in deficiency of same factors as for prolonged PTT.o Thrombin time : It tests the conversion of fibrinogen to fibrin and is elevated in fibrinogen deficiency.o Bleeding time : this altered in platelet dysfunction.", 'role': 'assistant'}]