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
In emergency tracheostomy all structures are damaged except: 
Select and explain. 
A. Isthmus of thyroid, B. Inferior thyroid aery, C. Thyroid ima, D. Inferior thyroid vein
B: Inferior thyroid aery
Answer: B: Inferior thyroid aery 
Explanation: 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.