This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Torus Aoicus is present in \nSelect and explain. \nA. Right Atrium, B. Right Ventricle, C. Left Ventricle, D. Left Atrium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Torus aoicus is the prominent region of the right atrial septum, which marks the projection of the non-coronary aoic sinus into the right atrial wall. The bulge is superior to the coronary sinus and anterior to the fossa ovalisReference: Vishram Singh Anatomy; 2nd edition; Page no: 265', 'role': 'assistant'}]