question: Q:A 4-month-old girl is brought to the physician because she has been regurgitating and vomiting 10–15 minutes after feeding for the past 3 weeks. She is breastfed and formula-fed. She was born at 38 weeks' gestation and weighed 2966 g (6 lb 9 oz). She currently weighs 5878 g (12 lb 15 oz). She appears healthy. Vital signs are within normal limits. Examination shows a soft and nontender abdomen and no organomegaly. Which of the following is the most appropriate next best step in management?? 
  {'A': 'Esophageal pH monitoring', 'B': 'Upper endoscopy', 'C': 'Ultrasound of the abdomen', 'D': 'Pantoprazole therapy', 'E': 'Positioning therapy'},