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: Anatomy
[{'content': 'In emergency tracheostomy the followingstructures are damaged except: \nSelect and explain. \nA. Isthmus of the thyroid, B. Inferior thyroid aery, C. Thyroid ima, D. Inferior thyroid vein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Inferior thyroid aery Ref: Keith L Moore 5/e p1100]Isthmus, thyroid ima aery and inferior thyroid veins are midline structures and thus can be injured during tracheostomy, more so during emergency tracheostomy. Inferior thyroid aery, a branch of the thyrocervical trunk of the subclan aery lies laterally away from midline, thus can escape injury.In emergency tracheostomy following structures can be damaged:- Isthmus- Inferior thyroid veins- Thyroid ima aery- Left brachio-cephalic vein, jugular venous arch- Pleura (especially infants)- Thymus- Esophagus (the trachea is small, mobile, and soft in infants damage the esophagus)', 'role': 'assistant'}]