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': "Acquired mega-colon in children most commonly due to – \nSelect and explain. \nA. Psychological problems, B. Bad bowel habit, C. Chaga's disease, D. Hirschsprung's disease", 'role': 'user'}, {'content': "Answer: B \nExplanation: Megacolon\n\nMegacolon is an abnormal dilatation of colon that is not caused by mechanical obstruction.\nTwo main types of megacolon are -\n\n\nCongenital megacolon → Hirschsprung disease\nAcquired megacolon\n\n\nPoor bowel habit \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nIdiopathic\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\nInfections → Chaga's disease\xa0\nMedication Antipsychotic drugs", 'role': 'assistant'}]