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
[{'content': 'Scalene tubercle is a feature of- \nSelect and explain. \nA. 1st rib, B. 2nd rib, C. 3rd rib, D. 4th rib', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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)', 'role': 'assistant'}]