This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology, Subject name: Anatomy
[{'content': 'A midline protrusion in maxillary region is mostly due to \nSelect and explain. \nA. Torus palatinus, B. Torus maxillaris, C. Torus mandibularis, D. Torus tubarius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Torus means an elevation. Different types according to location: Torus palatinus: - Midline elevation of exaggerated bony growth at intermaxillary suture region specifically in the midline Torus maxillaris: - Exaggerated bony growth at either inner side of alveolar process or at outer side of alveolar process (either side of teeth) Torus mandibularis: - Exaggerated bony growth - near the premolar & above the mylohyoid line. Torus tubaris: - Mucosal elevation in nasopharynx at opening of the eustachian tube.', 'role': 'assistant'}]