<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 6-year-old girl is brought to the pediatrician for the first time by her mother. Her mother states that her family just emigrated from China and her daughter has seemed to have difficulty adjusting to the American diet. Specifically, she seems to have abdominal discomfort and increased flatulence whenever she eats milk or cheese. The pediatrician orders a test to diagnose the patient. Which of the following results is most likely to be observed in this patient?? A: Negative hydrogen breath test, B: Abnormal small bowel biopsy, C: Positive hydrogen breath test, D: Positive technetium 99 scan, E: Abnormal abdominal ultrasound,  <response>: This is a clinical vignette about a 6-year-old girl who recently emigrated from China and is having gastrointestinal issues after consuming dairy products. The history provided suggests she may have lactose intolerance, which is common in Asian populations due to lower prevalence of lactase persistence. The physician ordered a diagnostic test. A positive hydrogen breath test would confirm lactose intolerance, as undigested lactose travels to the colon where it is fermented by bacteria, producing hydrogen gas that is absorbed and detected on the breath test. The other tests listed would not help diagnose lactose intolerance.C: Positive hydrogen breath test 