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: Medicine
[{'content': 'Pembeon sign in seen in ? \nSelect and explain. \nA. Retrosternal goiter, B. Grave opthalmopathy, C. Thyroid crisis, D. Addisonian crisis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Retrosternal goiterThe pembeon maneuver is a physical examination method that elicits manifestations of latent increased pressure in the thoracic inlet by altering arm position to fuher marrow the apeure.', 'role': 'assistant'}]