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: Medicine
[{'content': 'A9 year old boy with elevation in both PT and APTT.What is the diagnosis - \nSelect and explain. \nA. Defect in extrinsic pathway, B. Defect in intrinsic pathway, C. Platelet function defect, D. Defect in common pathway', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]