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': "Main objective of Tweed's analysis: \nSelect and explain. \nA. Determination of the position of lower incisors and evaluation of prognosis of a case., B. Profile of an individual, C. Relationship between maxillary central and mandibular central incisors, D. The position of maxilla and mandible to each other", 'role': 'user'}, {'content': "Answer: A \nExplanation: The main objective of Tweed's analysis includes the determination of the position of lower incisor and evaluation of the\xa0prognosis of a case. The angles in Tweed's analysis are FMIA, IMPA\xa0and FMPA.\nIncisor mandibular plane angle (IMPA) is the angle between long axis of lower incisor with the mandibular plane. The mean value is 90°. It indicates the inclination of lower incisor.", 'role': 'assistant'}]