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': "A 9 yr old girl has a bleeding diathesis, with prolonged APTT but normal PT, and normal platelet count. The diagnosis is - \nSelect and explain. \nA. Factor V deficiency, B. Haemophilia A, C. Haemophila B, D. VonWillebrand's disease", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]