This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
In the costal groove of which of the following ribs is the classic arrangement of vein-aery-nerve is not seen 
Select and explain. 
A. 1, B. 2, C. 11, D. 12
A: 1
Answer: A: 1 
Explanation: The classic vein-aery-nerve arrangement is not seen in the 1st rib In the first rib, the arrangement of structures seen medial to lateral are as follows: SVAN Sympathetic trunk Vein (intercostal) Aery(superior intercostal) Nerve (T1 nerve) Ref: Gray's Anatomy 41st edition Pgno: 943-945