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': 'Prolonged thumb sucking directly results in all of the following except: \nSelect and explain. \nA. Deep overbite, B. Proclination of upper centrals, C. Anterior open bite, D. Constriction of maxilla', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Effects on Maxilla\n\nProclination of maxillary incisors.\nIncreased arch length.\nIncreased anterior placement of apical base of maxilla.\nIncrease in SNA angle.\nIncreased clinical crown length of maxillary incisors.\nIncreased counter-clockwise rotation of occlusal plane.\nDecreased width of palate.\xa0\nAtypical root resorption of primary central incisors.\nTrauma to maxillary central incisors.\nConstriction of maxilla.\n\nEffects on Mandible\xa0\n\nProclination of mandibular incisors.\nIncreased mandibular intermolar width.\nMore distal position of point B: Mandible is more distally placed relative to the maxilla.\nMandibular incisors experience a lingual and apical force.\n\nInter-arch Relationship\xa0\n\nDecreased inter-incisal angle\nIncreased overjet\nDecreased overbite\nPosterior open bite\nAnterior open bite\nNarrow nasal floor and high palatal vault.', 'role': 'assistant'}]