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: Ophthalmology
[{'content': "The most common lid sign associated with Grave's ophthalmopathy is \nSelect and explain. \nA. Von Graefe's sign, B. Dalrymple's sign, C. Stellwag's sign, D. Rosenbach's sign", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. Dalrymple's sign", 'role': 'assistant'}]