<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 53-year-old man presents to your office with a 2 month history of abdominal bloating. He states that he feels full after eating only a small amount and has experienced bloating, diarrhea, and occasionally vomiting when he tries to eat large amounts. He states his diarrhea has now become more profuse and is altering the quality of his life. One week ago, the patient was given antibiotics for an ear infection. He states he is trying to eat more healthy and has replaced full fat with fat free dairy and is reducing his consumption of meat. His temperature is 99.0F 37.2C, blood pressure is 16499 mmHg, pulse is 85min, respirations are 14min, and oxygen saturation is 98 on room air. Laboratory values from a previous office visit are notable for a hemoglobin A1c of 13. Which of the following is the best treatment of this patients diarrhea?? A: Better glycemic control, B: Elimination of dairy from the diet, C: Metoclopramide, D: Rifaximin, E: Vancomycin,  <response>: This is a patient with new onset profuse diarrhea in the setting of recent antibiotic use and dietary changes. The key points from the stem are:- 53 year old man with 2 month history of abdominal bloating, diarrhea, vomiting when eating large amounts- Diarrhea now more profuse and affecting quality of life - Given antibiotics for ear infection 1 week ago- Trying to eat more healthy, replaced full fat with fat free dairy, reducing meat intake- Vital signs notable for mild fever and hypertension- Hemoglobin A1c of 13 indicates poorly controlled diabetesThe recent antibiotic use raises suspicion for C. difficile infection causing the diarrhea. Elimination of dairy is unlikely to help diarrhea. Metoclopramide may help vomiting but not diarrhea. The choices of rifaximin and vancomycin are antibiotics used to treat C. difficile. Of these two, rifaximin is preferred first line due to lower risk of resistance. D: Rifaximin 