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
Prothrombin time is prolonged in all of the following
except: 
Select and explain. 
A. Liver disease, B. Disseminated intravascular coagulation, C. Warfarin therapy, D. Von-Willebrand's disease
D: Von-Willebrand's disease
Answer: D: Von-Willebrand's disease 
Explanation: None