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': 'Organic causes of constipation in infant are all except –a)  High fibre dietb)  Cystic fibrosisc)  Hypothyroidismd)  Hyperthyroidism \nSelect and explain. \nA. b, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Constipation in infants and children\nConstipation is extremely common in pediatric population. The vast majority of cases (90-95%) are functional i.e. 90-95% have functional constipation with no organic disease.\xa0In 1-5% cases, the organic disease can be diagnosed as cause of constipation, i.e. only 1-5% have organic causes of constipation.\nOrganic causes of constipation are:\n\nIntestinal: Hirschprung disease, Anal/rectal stenosis, Anal fissure, anteriorly displaced anal opening, stric\xadtures.\nDrugs: Narcotics, vincristine, Psychotropics.\nMetabolic/endocrine: Cystic fibrosis, hypothyroidism, Panhypopituitrism.\nNeuromuscular: Cerebral palsy, Psychomotor retardation, spinal cord lesions, Myotonic dystophy, Neuropathy or myopathy of GIT.\nOther causes: Low fibre diet, Milk protein allergy.', 'role': 'assistant'}]