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: Surgery
[{'content': 'Delayed prolonged bleeding after a minor surgery is caused by defect in \nSelect and explain. \nA. Primary hemostasis., B. Secondary hemostasis., C. Defect in capillary bed to support the clot., D. Defect in connective tissue to support capillaries', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]