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
Adhesion of platelets to collagen is due to - 
Select and explain. 
A. Factor IX, B. Fibrinogen, C. Von Willebrand factor, D. Fibronectin
C: Von Willebrand factor
Answer: C: Von Willebrand factor 
Explanation: . Von Willebrand factor