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: Surgery
Antenatal double bubble appearance on ultrasound is due to - 
Select and explain. 
A. Diaphragmatic hernia, B. Duodenal atresia, C. Gastric volvulus, D. Intussusception
B: Duodenal atresia
Answer: B: Duodenal atresia 
Explanation: None