This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrical Ultrasonography in the First Trimester, Subject name: Radiology
[{'content': 'Spalding sign is seen in - \nSelect and explain. \nA. Abortion, B. Still birth, C. IUD, D. Infanticide', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., IUD o One important radiological sign suggestive of maceration in intrauterine death is Spaulding sign, i.e. skull bones over ride each other.", 'role': 'assistant'}]