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': "Robert's sign is a feature of \nSelect and explain. \nA. Le fort fracture grade II, B. Dead born Infant, C. Live Born Infant, D. Orbital fracture", 'role': 'user'}, {'content': "Answer: B \nExplanation: Robert's sign is appearance of gas shadow in chambers of heart and great vessels. It is seen in dead born infant.", 'role': 'assistant'}]