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: Pathology
Platelet adhesion to collagen occurs 
Select and explain. 
A. Factor VIII, B. Factor IX, C. Von-Willebrand factor, D. Fibronectin
C: Von-Willebrand factor
Answer: C: Von-Willebrand factor 
Explanation: . Von-Willebrand factor