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
Double track sign is seen in 
Select and explain. 
A. Duodenal atresia, B. CHPS, C. Gastric ulcer, D. Achalasia
B: CHPS
Answer: B: CHPS 
Explanation: Double/triple track sign is seen in congenital hypertrophic pyloric stenosis