This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Gastrointestinal System Including Diarrhea, Subject name: Pediatrics
[{'content': "Acquired megacolon in children most commonly occurs 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:abnormal dilatation of colon that is not caused by mechanical obstruction Types of megacolon: Congenital megacolon- Hirschsprung disease Acquired megacolon: Poor bowel habit (MC), infections (Chagas disease), idiopathic, antipsychotic drugs.', 'role': 'assistant'}]