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': 'Following injury to a blood vessel, immediate haemostasis is achieved by \nSelect and explain. \nA. Fibrin deposition, B. Vasoconstriction, C. Platelet adhesion, D. Thrombosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]