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: Pathology
[{'content': 'Which of the following pathway does aPTT measure \nSelect and explain. \nA. Intrinsic pathway, B. Extrinsic pathway, C. Both intrinsic and extrinsic, D. Complement pathway', 'role': 'user'}, {'content': 'Answer: B \nExplanation: activated paial thromboplastin time The paial thromboplastin time (PTT) or activated paial thromboplastin time (aPTT orAPTT) is a blood test that characterizes coagulation of the blood. A historical name for this measure is the kaolin-cephalin clotting time (KCCT), reflecting kaolin and cephalin as materials historically used in the test. Ref Robbins 9/e pg 450', 'role': 'assistant'}]