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
[{'content': 'Triad of vomiting, abdominal distension and "String of beads" sign on abdominal X-ray is typically suggestive of – \nSelect and explain. \nA. Duodenal atresia, B. Small bowel obstruction, C. Large bowel obstruction, D. Gastric volvulus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Strings of beads" sign is pathognomonic of small bowel obstruction.', 'role': 'assistant'}]