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
Acquired megacolon in children most commonly due to- 
Select and explain. 
A. Psychological problems, B. Bad bowel habit, C. Chaga's disease, D. Hirschsprung's disease
B: Bad bowel habit
Answer: B: Bad bowel habit 
Explanation: 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