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
Which does not take pa in formation of right subclan aery ? 
Select and explain. 
A. 2nd arch aery, B. 4th arch aery, C. 7th arch aery, D. All three take pa
A: 2nd arch aery
Answer: A: 2nd arch aery 
Explanation: Ans. is 'a' i.e., 2nd arch aery