<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 5-week-old male infant is brought to the physician by his mother because of a 4-day history of recurrent nonbilious vomiting after feeding. He was born at 36 weeks gestation via spontaneous vaginal delivery. Vital signs are within normal limits. Physical examination shows a 2-cm epigastric mass. Further diagnostic evaluation of this patient is most likely to show which of the following?? A: High serum 17-hydroxyprogesterone concentration, B: Dilated colon segment on abdominal x-ray, C: Double bubble sign on abdominal x-ray, D: Elongated and thickened pylorus on abdominal ultrasound, E: Corkscrew sign on upper gastrointestinal contrast seriesn,  <response>: This is a clinical vignette describing a 5-week-old infant with a history of nonbilious vomiting and an epigastric mass on exam. The key findings are the young age, vomiting, and palpable abdominal mass. This presentation is classic for hypertrophic pyloric stenosis. Imaging would show elongated and thickened pylorus. The other choices do not fit with the clinical presentation.D: Elongated and thickened pylorus on abdominal ultrasound 