This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck Triangles and parotid gland, Subject name: Anatomy
[{'content': 'In emergency tracheostomy all structures are damaged except: \nSelect and explain. \nA. Isthmus of thyroid, B. Inferior thyroid aery, C. Thyroid ima, D. Inferior thyroid vein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Emergency tracheostomy can damage midline structures such as : thyroid isthmus, thyroid ima aery and inferior thyroid vein. Whereas, inferior thyroid aery lies laterally away from midline and so escapes injury.', 'role': 'assistant'}]