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
[{'content': 'The asterisk is denoting towards which of the following structures? \nSelect and explain. \nA. Right anterior 4th rib, B. Right clavicle, C. Right posterior 5th rib, D. Major fissure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Posterior Ribs are Horizontal and Anterior Ribs are Oblique on Chest X-ray PA view The asterisk points to right anterior 4th rib.', 'role': 'assistant'}]