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: Dental
[{'content': 'A contusion usually result from \nSelect and explain. \nA. Cut injury, B. Blunt trauma, C. Crush injury, D. Penetrating injury', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]