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 mega-colon 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: Megacolon

Megacolon is an abnormal dilatation of colon that is not caused by mechanical obstruction.
Two main types of megacolon are -


Congenital megacolon → Hirschsprung disease
Acquired megacolon


Poor bowel habit                             
Idiopathic             
Infections → Chaga's disease 
Medication Antipsychotic drugs