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: Pediatrics
[{'content': 'Mild MR – features are–a) Present in 5–10% populationb) ↑ Incidence in low socioeconomic groupc) Presents in 2 yearsd) Genetic background Present \nSelect and explain. \nA. c, B. d, C. bd, D. ac', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mental retardation\n\nMental retardation (MR) refers to a group of disorders that have in common deficits of adaptive & intellectual function & an age of onset before maturity is reached.\nAccording to statistics, 2.5% of the population should have MR, & 85% of these individuals should fall into the range of mild MR.\n\nPresentation\n\nMR presents by the age of the patient, i.e.\n\nNewborn : Dysmorphism, major organ system dysfunction.\nEarly infancy (2-4 months) : Failure to interact with the environment, vision & hearing impairment.\nLate infancy : Gross motor delay\nToddlers (2-3 yrs) : Language delays & difficulties.\nSchool age (over 5 yrs) : Academic underachievement & behaviour difficulties.\nPredisposing factors for mental retardation\ni)\xa0\xa0\xa0 Low socio - economic strata\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 iii) Advanced maternal age\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 v) Genetically transmitted\nLow birth weight\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 iv) Consanguinity', 'role': 'assistant'}]