This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Joints, Subject name: Anatomy
Scalene tubercle is a feature of- 
Select and explain. 
A. 1st rib, B. 2nd rib, C. 3rd rib, D. 4th rib
A: 1st rib
Answer: A: 1st rib 
Explanation: Ans. is 'a' i.e., 1st rib o Scalene tubercle is present at the inner border of Is" rib.Superior view of the first rib (left side)