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: Forensic Medicine
[{'content': 'The killing range of a military rifle is about - \nSelect and explain. \nA. 100 yards, B. 600 yards, C. 1000 yards, D. 300 yards', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is 600 yards', 'role': 'assistant'}]