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
[{'content': "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: \nSelect and explain. \nA. Joffroy's sign, B. Von graffe's sign, C. Moebius sign, D. Dalrymple's sign", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Various other eye signs seen in thyrotoxicosis are:', 'role': 'assistant'}]