This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood Disorders, Subject name: Psychiatry
[{'content': "An objective sign of depression involving the upper eyelid is: \nSelect and explain. \nA. Veraguth sign, B. Omega sign, C. Empty delta sign, D. Hoffman's sign", 'role': 'user'}, {'content': "Answer: A \nExplanation: Veraguth's sign Objective sign of depression. It was described by Otto Veraguth. It is a triangular fold on the nasal side of the upper eye lid. The patient appears to have a distant stare.", 'role': 'assistant'}]