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
Earliest sign of raised ICT is: 
Select and explain. 
A. Erosion of dorsum sella, B. Copper beaten appearance, C. Silver beaten appearance, D. Displacement of pineal gland
A: Erosion of dorsum sella
Answer: A: Erosion of dorsum sella 
Explanation: Erosion of dorsum sella