A 63-year-old man is hospitalised with increasing colic type abdominal pain that lasts for 3 days, constipation, vomiting. Gas passage is normal. Objective: Abdominal distension, intestinal hyperperistalsis, slightly inflated rectum, no blood in stool. Which method do you start investigation with?
A. Colonoscopy
B. Mesentericography
C. Plain abdominal x-ray
D. Stomach barium x-ray examination
E. Irrigoscopy
Answer: C. Plain abdominal x-ray