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
The surface marking of the arch of aorta is as follows - 
Select and explain. 
A. Behind the manubrium sterni, B. 2nd intercostal space, C. 3rd intercostal space, D. Left 2nd costal cartilage
A: Behind the manubrium sterni
Answer: A: Behind the manubrium sterni 
Explanation: Arch of Aorta surface marking

Right end of sternal angle
Centre of manubrium sterni
Sternal end of left second costal cartilage

These points when connected lies behind the lower half of manubrium sterni.