This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal obstruction, Subject name: Surgery
A 40 years old male was brought to the emergency with the history of colicky pain, multiple episodes of bilious vomiting with no passage of feces and flatus. X-ray abdomen was done. On the basis of findings, what is the diagnosis? 
Select and explain. 
A. Duodenal obstruction, B. Jejunal obstruction, C. Ileal obstruction, D. Colonic obstruction
B: Jejunal obstruction
Answer: B: Jejunal obstruction 
Explanation: No passage of flatus - Small bowel obstruction X-ray abdomen shows - 1. Multiple dilated bowel loops and 2. Circumferential ring like pattern indicating - JEJUNAL OBSTRUCTION Small Bowel obstruction Large bowel obstruction Valvulae conniventes Thin complete lines seen in jejunum Absent Haustra Absent Thick incomplete bands No of loops Many Few Distribution of loops Central Peripheral Diameter of loops 3-6 cm >5 cm Radius of curvature Small Large Solid faeces Absent Present VALVULAE CONNIVENTIS