This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pediatrics
Chronic constipation in children is seen in all A/E 
Select and explain. 
A. Hirschspring disease, B. Jejunal polyp, C. Hypothyroidism, D. Stricture
B: Jejunal polyp
Answer: B: Jejunal polyp 
Explanation: Causes of constipation : Intestinal drugs metabolic neuromuscular others hirschsprung,sdisease anal stenosis anal fissure anteriorly displaced anal opening stricture narcotics vincristine psychotropics cystic fibrosis hypothyroidism panhypopituitarism cerebral palsy psychomotor retardation spinal cord lesions myotonic dystrophy neuropathy or myopathy of GIT low fibre diet milk protein allergy Ref : ESSENTIAL PEDIATRICS,O.P.GHAI,PG NO:255