<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 26-year-old woman comes to the physician because of intermittent episodes of cramping lower abdominal pain and bloating over the past 3 months. These episodes are often associated with non-bloody, watery, frothy stools, and excessive flatulence. The cramping does not subside after defecation. She reports that her symptoms typically begin an hour or two after eating ice cream, cheese, or pudding. She is otherwise healthy. Her only medication is an iron supplement and an oral contraceptive pill. The patients height is 158 cm 5 ft 2 in and her weight is 59 kg 130 lb; her BMI is 23.6 kgm2. Abdominal examination is normal. Which of the following is the most appropriate next step in management?? A: Fecal fat test, B: D-xylose absorption test, C: Jejunal biopsy, D: Hydrogen breath test, E: Serum IgE levels,  <response>: This is a patient with symptoms of intermittent cramping lower abdominal pain, bloating, watery diarrhea, flatulence, and symptoms triggered by dairy products. The key finding is that symptoms are triggered by ingestion of dairy products like ice cream, cheese, and pudding. This suggests the possibility of lactose intolerance. The choices given are diagnostic tests for malabsorption disorders. Fecal fat test checks for fat malabsorption. D-xylose absorption test checks for small intestinal malabsorption. Jejunal biopsy can evaluate small intestinal mucosa. Hydrogen breath test detects carbohydrate malabsorption by measuring hydrogen production from undigested carbohydrates. Serum IgE levels test for food allergies.Of these choices, the hydrogen breath test is the most appropriate next step to confirm the suspected diagnosis of lactose intolerance in this patient with typical symptoms triggered by dairy products.D: Hydrogen breath test 