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
Reactionary hemorrhage occurs after extraction
because of 
Select and explain. 
A. Broken roots, B. High blood pressure, C. Sharp interdental septum, D. Gingival laceration
B: High blood pressure
Answer: B: High blood pressure 
Explanation: None