<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 33-year-old woman presents to the urgent care center with 4 days of abdominal pain and increasingly frequent bloody diarrhea. She states that she is currently having 6 episodes of moderate volume diarrhea per day with streaks of blood mixed in. She says she recently returned from a long camping trip with her friends where they cooked all of their own food and drank water from nearby streams. Physical examination is negative for acute tenderness, rebound tenderness, or abnormal bowel sounds. Her vital signs include temperature 38.0C 100.4F, blood pressure 10674 mm Hg, heart rate 94min, and respiratory rate 14min. Given the following options, which is the most likely pathogen responsible for her presentation?? A: Clostridium difficile, B: Campylobacter, C: E. coli 0157:H7, D: Salmonella, E: Shigella,  <response>: Based on the information provided, this patient likely has a gastrointestinal infection acquired during her recent camping trip where she drank untreated water from streams. The symptoms of abdominal pain, bloody diarrhea, and fever point towards an infectious diarrhea. The choices provided include both toxin-mediated and invasive pathogens. C. difficile is unlikely as this requires prior antibiotic exposure. E. coli O157:H7 and Shigella are both possible. However, the bloody diarrhea and lack of fever make Campylobacter the most likely pathogen. Campylobacter is commonly acquired from untreated water and produces an inflammatory diarrhea.B: Campylobacter 