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: Surgery
When the patient is asked to look upwards with the head fixed, there will be absence of wrinkling on the forehead, this is known as: 
Select and explain. 
A. Joffroy's sign, B. Von graffe's sign, C. Moebius sign, D. Dalrymple's sign
A: Joffroy's sign
Answer: A: Joffroy's sign 
Explanation: Various other eye signs seen in thyrotoxicosis are: