This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'A 20 year old male patient, is unhappy with the appearance of his front tooth and wants to get it straightened. According to Lischer’s modification, the central incisor can be aptly classified as: \nSelect and explain. \nA. Torsiversion, B. Perversion, C. Transversion, D. Axiversion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lischer in 1933 further modified Angle’s classification by giving substitute names:\n\nCL I (Neutrocclusion)\nCL II (Distocclusion)\xa0\nCL III (Mesiocclusion)\n\n\xa0He also proposed terms to designate individual tooth malposition:\n\nMesioversion: Mesial to normal position\nDistoversion: Distal to normal position\nLinguoversion: Crossbite\nLabioversion: Increased overjet\nInfraversion: Submerged tooth\nSupraversion: Supraerupted tooth\nAxiversion:\xa0Abnormal inclination\nTorsiversion: Rotated tooth\nTransversion: Transposed tooth\nPerversion:\xa0Impacted tooth\n\nRef: Kharbanda OP. Orthodontics: Diagnosis of & Management of Malocclusion & Dentofacial Deformities. 3rd edition page 333\nImage: Kotha SB. Intra-alveolar auto-transplantation to correct a single tooth rotation: A case report with four years of follow-up. Saudi Journal of Oral Sciences. 2014 Jul 1;1(2):110.', 'role': 'assistant'}]