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
Target sign on USG is seen in 
Select and explain. 
A. Congenital hypertrophic pyloric Stenosis, B. Gastric ulcers, C. Achalasia, D. All the above
A: Congenital hypertrophic pyloric Stenosis
Answer: A: Congenital hypertrophic pyloric Stenosis 
Explanation: Target sign - hypoechoic ring and hypertrophied pyloric muscle around echogenic mucosa
Centrally on transverse Scan - Seen in CHPS.