This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
[{'content': 'Where is bruit heard in thyroid gland in Toxicosis? \nSelect and explain. \nA. Upper pole, B. Lower pole, C. Middle pole, D. Lateral side', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Upper poleRef: Schwartz principles of surgery, 10th edition, Page 1531* At the level of insertion of superior thyroid artery due to increased blood flow the Bruit is heard at upper pole', 'role': 'assistant'}]