1. A 32-year-old man presents to the Emergency Department with sudden-onset central abdominal pain..

1. A 32-year-old man presents to the Emergency Department with sudden-onset central abdominal pain and vomiting. He describes the pain as cramp-like and intermittent in nature with the vomitus being green in colour. Routine observations reveal a temperature of 37.6°C, blood pressure of 101/76 mmHg and pulse rate of 101 beats per minute. On examination his abdomen is notably distended with evidence of guarding. What is the most likely diagnosis? a) Large bowel obstruction b) Simple constipation c) Small bowel obstruction d) Intestinal perforation e) Pyloric stenosis