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
Organic causes of constipation in infant are all except 
Select and explain. 
A. High fibre diet, B. Cystic fibrosis, C. Hypothyroidism, D. Hypehyroidism
A: High fibre diet
Answer: A: High fibre diet 
Explanation: Constipation can be functional or organic . Organic causes of constipation INTESTINAL DRUGS METABOLIC NEUROMUSCULAR OTHERS Hirschsprung disease narcotics cystic fibrosis cerebral palsy low fibre diet anal stenosis vincristine hypothyoidism spinal cord lesions milk protein allergy anal fissure psychotropics panhypopituitarism myotonic dystrophy anteriorly displaced anal opening,stricture neuropathy or myopathy of GI tract Ref : ESSENTIAL PEDIATRICS,O.P.GHAI,PG NO:255,7th edition