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': 'The neonatal teeth in infants are: \nSelect and explain. \nA. Teeth of normal series usually, B. Supernumerary teeth, C. Only calcified structures, D. Only keratinised structures', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most studies suggest that the etiology for the premature\xa0eruption\xa0or\xa0the\xa0appearance\xa0of\xa0natal\xa0and\xa0neonatal\xa0teeth\xa0is\xa0multifactorial.\xa0A\xa0possible factor\xa0involving\xa0 the early eruption of primary teeth seems to be familial, due to inheritance as an autosomal-dominant trait.\nA radiograph should be made to determine the amount of root development and the relationship of a prematurely erupted tooth to its adjacent teeth. One of the parents can hold the x-ray film in the infant’s mouth during the exposure.\nMost\xa0 prematurely\xa0 erupted\xa0 teeth\xa0 (immature\xa0 type) are hypermobile because of limited root development.\xa0\nSome teeth may be mobile to the extent that there is danger\xa0 of\xa0 displacement\xa0 of\xa0 the\xa0 tooth\xa0 and\xa0 possible\xa0 aspiration,\xa0 in\xa0 which\xa0 case\xa0 the\xa0 removal\xa0 of\xa0 the\xa0 tooth\xa0 is indicated. In some cases the sharp incisal edge of the\xa0tooth may cause laceration of the lingual surface of the tongue (Riga-Fede disease), and the tooth may have to\xa0be removed.\nThe neonatal teeth in infants are teeth of normal series usually.\nReference: McDONALD AND AVERY’S DENTISTRY for the CHILD and ADOLESCENT, 10th ed page no 356', 'role': 'assistant'}]