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
Stellwagg's sign of graves disease is 
Select and explain. 
A. Difficulty in eversion of upper lid, B. Infrequent blinking, C. Fullness of eyelids, D. Lid lag
B: Infrequent blinking
Answer: B: Infrequent blinking 
Explanation: Lid lag - Von graefe's sign.
Fullness of eyelids - Enroth's sign.