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
Sign of thyroid ophthalmopathy - 
Select and explain. 
A. Von Graefe's sign, B. Dalrymple's sign, C. Gifford's sign, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: von Graefe's sign - lid lag Dalrymple&;s sign - Retraction of upper lid producing staring and frightening appearance. Most common C/f. Gifford&;s sign - difficulty inversion of upper lid. Stellwag&;s sign - infrequent blinking. Ref: AK Khurana 6thE pg414