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': "A patient with a nodular thyroid swelling is suspected to have hypehyroidism. On examination there was absence of wrinkling on forehead when looking upwards with face inclined downwards. Which term denote this sign? \nSelect and explain. \nA. Von Graefe's sign, B. Joffrey's sign, C. Stellwag's sign, D. Moebius sign", 'role': 'user'}, {'content': "Answer: B \nExplanation: Von Graefe's sign - upper eye lid lags behind the eyeball when the patient looks down. Stellwag's sign - Staring look with infrequent blinking of eyes and widening of palpebral fissure. Moebius sign - Inability to converge eyeball Joffroy's sign - Absence of wrinkling of forehead when the patient looks upwards with face inclined downwards. Ref: Das, 5th Edition, Page 291.", 'role': 'assistant'}]