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': 'The most common etiology of short stature is \nSelect and explain. \nA. Thyroxine deficiency, B. Growth hormone deficiency, C. Constitutional growth delay, D. Systemic diseases', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Short\xa0Stature\nDefined as height below the third centile or more than 2 standard deviations below the median height for age and gender according to the population standard. Children whose statures more than 3 SD below the population mean for age and gender are more likely to be suffering from pathological short stature as compared to those with stature between -2 and -3SD, who are more likely to be affected by familial or constitutional short stature.\nCAUSES:-\n\nThe most common cause is constitutional.\nFamilial\nPathological causes include:\n\tUndernutrition\n\tChronic systemic illness\n\tCerebral palsy\n\tCongenital heart disease\n\tCystic fibrosis, asthma\n\tMalabsorption\n\tAcquired immunodeficiency syndrome\nEndocrine causes include:\n\xa0Psychosocial dwarfism.\nChildren born small for gestational age.\nSkeletal dysplasia; achondroplasia, rickets.\nGenetic syndrome; Turner, Down syndrome.', 'role': 'assistant'}]