This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiological anatomy, Subject name: Radiology
The asterisk is denoting towards which of the following structures? 
Select and explain. 
A. Right anterior 4th rib, B. Right clavicle, C. Right posterior 5th rib, D. Major fissure
A: Right anterior 4th rib
Answer: A: Right anterior 4th rib 
Explanation: Posterior Ribs are Horizontal and Anterior Ribs are Oblique on Chest X-ray PA view The asterisk points to right anterior 4th rib.