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
Desmopressin nasal spray is most useful in which of the following Von Willibrand Disease? 
Select and explain. 
A. Type 1 VWD, B. Type 2A VWD, C. Type 3 VWD, D. Type I & Type III
A: Type 1 VWD
Answer: A: Type 1 VWD 
Explanation: It increases the release of VWF from endothelium. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 972.