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': 'At some mass casualty ,patients with mandibular fractures are categorized under which of the following color code: \nSelect and explain. \nA. Red, B. Yellow, C. Green, D. Black.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]