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: Unknown
[{'content': 'Earliest sign in papilledema is - \nSelect and explain. \nA. Blurring of disc margins, B. Venous engorgement, C. Hyperemia of disc, D. Cotton wool spots', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans- B Venous engorgement Please note -latest studies say Venous engorgement is seen earlier than The blurring of disc margins.', 'role': 'assistant'}]