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: Radiology
[{'content': 'Which of this is not a sign of increased ICT? Copper beaten appearance \nSelect and explain. \nA. Copper beaten appearance, B. Erosion of dorsum sella, C. Ballooning of sella, D. Sutural diastasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Ballooning of sella', 'role': 'assistant'}]