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': 'Mental retardation is not seen in - \nSelect and explain. \nA. Downs syndrome, B. Cretinism, C. Hypopituitarism, D. Birth asphyxia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Prenatal factors\n1. Metabolic\ni) Aminoaciduria-phenylketonuria, homocystinemia, histidinemia, organic aciduria\nii) Galactosemia\niii) Mucopolysaccharidosis\niv)Inherited degenerative disorders of the central nervous system\n2. Chromosomal disorders. Down's syndrome, Fragile X syndrome, Klinefelter\n3. Environment and nutrition gaps, iodine deficiency\n4. Neuroectodermal dysplasia. Tuberous sclerosis.\n5. Developmental defects. Microcephaly, craniostenosis, cretinism, porencephaly.\n6. Maternal factors\ni) Use of teratogenic drugs in the first trimesters of pregnancy\nii) Infections such as rubella, toxoplasmosis, cytomegalic inclusion disease,\xa0herpes syphilis and HIV.\niii) Placental insufficiency\niv)Toxemia of pregnancy\nv) Antepartum hemorrhage\nvi)Radiation during pregnancy\nNatal factors\n\nBirth injuries\xa0\xa0 3. Intracerebral hemorrhage\nHypoxic, ischemic encephalopathy\n\nPostnatal factors\n\nInfections of central nervous system.\xa0\n\nMeningoencephalitis\n2. Head injuries\n3. Hypoxia\n4. Cerebrovascular. Thrombosis of cerebral vessels\n5. Post-vaccinal encephalopathies\n6. Kemicterus\n7. Hypoglycemia\n8. Malnutrition\n9. Child abuse\xa0\n10. Autism", 'role': 'assistant'}]