This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'Earliest symptom of thyroid opthalmopathy- \nSelect and explain. \nA. Proptosis, B. Lid retraction, C. Opthalmoplegia, D. Diplopia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *The Most common and earliest symptom is upper eyelid retraction. Ref: Head & Neck surgery 2nd/e p.1513', 'role': 'assistant'}]