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': 'All correlates with USG findings of pyloric stenosis except – \nSelect and explain. \nA. Accuracy 95%, B. High gastric residue, C. Segment length > 16 mm, D. Thickness of pylorus > 4 mm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.\nUSG findings of infantile pyloric stenosis are :\n\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0Target sign\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0- Pyloric muscle wall thickness →\xa0> 4mm\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0Cervix sign\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 - Pyloric length (segment length) → ≥\xa016mm\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0Antral nipple sign\xa0\xa0\xa0\xa0- Pyloric diameter a → ≥\xa015mm', 'role': 'assistant'}]