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 megacolon 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: Ans. is 'b' i.e., Bad bowel habit Megacolon Megacolon is an abnormal dilatation of colon that is not caused by mechanical obstruction. Two main types of megacolon are ? 1) Congenital megacolon --> Hirschsprung disease 2) Acquired megacolon Poor bowel habit Infections --> chaga's disease Idiopathic Medication Antipsychotic drugs", 'role': 'assistant'}]