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
All correlates with USG findings of pyloric stenosis except – 
Select and explain. 
A. Accuracy 95%, B. High gastric residue, C. Segment length > 16 mm, D. Thickness of pylorus > 4 mm
B: High gastric residue
Answer: B: High gastric residue 
Explanation: USG is the imaging modality of choice for evaluation of infantile pyloric stenosis. It is both highly sensitive (90-99%) and specific (95-100%) in the hands of a qualified sonographer.
USG findings of infantile pyloric stenosis are :

               Target sign             - Pyloric muscle wall thickness → > 4mm
               Cervix sign             - Pyloric length (segment length) → ≥ 16mm
               Antral nipple sign    - Pyloric diameter a → ≥ 15mm