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
[{'content': 'Adhesion of platelets to collagen is due to - \nSelect and explain. \nA. Factor IX, B. Fibrinogen, C. Von Willebrand factor, D. Fibronectin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Von Willebrand factor', 'role': 'assistant'}]