This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Triad of vomiting, abdominal distension and "String of beads" sign on abdominal X-ray is typically suggestive of – 
Select and explain. 
A. Duodenal atresia, B. Small bowel obstruction, C. Large bowel obstruction, D. Gastric volvulus
B: Small bowel obstruction
Answer: B: Small bowel obstruction 
Explanation: "Strings of beads" sign is pathognomonic of small bowel obstruction.