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
A neonate presented with fever, lathargy, abdominal distension, Vomiting and constipation. Clinically he was diagnsoed as volvulus nenatarum with suspected perforation. Best investigation would be 
Select and explain. 
A. Plain x-ray, B. Barium enema, C. Upper GI endoscopy, D. Barium meal follow through
A: Plain x-ray
Answer: A: Plain x-ray 
Explanation: .Volvulus neonatorum It is predisposed to by arrested gut rotation with a resultant narrow mesentry of the small bowel and caecum. Symptoms:repeated vomiting,dehydration,abdominal distension Abdominal radiography shows evidence of duodenal obstruction. Laprotomy shows distended stomach and coils of small bowel BAILEY AND LOVE&;S SHO PRACTICE OF SURGERY,PG NO:1197,24th edition