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
A 9 yr old girl has a bleeding diathesis, with prolonged APTT but normal PT, and normal platelet count. The diagnosis is - 
Select and explain. 
A. Factor V deficiency, B. Haemophilia A, C. Haemophila B, D. VonWillebrand's disease
D: VonWillebrand's disease
Answer: D: VonWillebrand's disease 
Explanation: None