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 5-year-old residential school child walks into your clinic with the habit of thumb sucking in association with bruxism.\nFollowing effects are seen on maxilla except: \nSelect and explain. \nA. Increased SN to ANS - PNS angle, B. Increased proclination, C. Increased maxillary arch length, D. Increased SNA', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Effects of Thumb/digits sucking in maxilla\n\nProclination of maxillary incisors: When a child places a thumb/finger between the teeth, it is usually positioned at an angle, so that it presses against the lingual palatal surface of the upper incisors and the lingual surface of the lower incisors. This direct pressure causes displacement of 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. Left/right side of anterior maxillary arch is usually deformed with deformation related to whether the right or left thumb is sucked.\nAtypical root resorption of primary central incisors.\nTrauma to maxillary central incisors (Primarily due to their prominence).\n\nRef: Textbook of Orthodontics Gurkeerat Singh Second edition', 'role': 'assistant'}]