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': 'Platelet adhesion to collagen occurs \nSelect and explain. \nA. Factor VIII, B. Factor IX, C. Von-Willebrand factor, D. Fibronectin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Von-Willebrand factor', 'role': 'assistant'}]