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
Upper two posterior intercostal aeries arise from ? 
Select and explain. 
A. Aoa, B. Superior intercostal aery, C. Internal mammary aery, D. Bronchial aery
B: Superior intercostal aery
Answer: B: Superior intercostal aery 
Explanation: Ans. B) Superior intercostal aeryThe 1st and 2nd posterior intercostal aeries arise from the supreme intercostal aery, a branch of the costocervical trunk of the subclan aery. The lower nine aeries are the aoicintercostals, so called because they arise from the back of the thoracic aoa.