<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 4-year-old boy presents to the emergency department with diarrhea. Several days ago, he experienced a fever which has progressed to vomiting and diarrhea. He has had multiple episodes of non-bloody diarrhea and states that he feels fatigued. He is not up to date on his vaccinations and takes many different herbal supplements from his parents. His temperature is 101F 38.3C, blood pressure is 10055 mmHg, pulse is 111min, respirations are 19min, and oxygen saturation is 100 on room air. Physical exam is notable for dry mucous membranes and a fatigued appearing child. Which of the following is the most likely etiology of this patients symptoms?? A: Campylobacter jejuni, B: Coronavirus, C: Norovirus, D: Rotavirus, E: Vibrio cholerae,  <response>: This is a case of a 4-year-old boy presenting with fever, vomiting, diarrhea, and fatigue. Based on the description, this is most likely a case of infectious gastroenteritis. The key findings are the fever, vomiting, diarrhea, and fatigue in a child. The answer choices include various bacterial, viral, and protozoal organisms that can cause gastroenteritis. Campylobacter jejuni is a bacteria that causes diarrhea but is less common in young children. Coronavirus and norovirus are possible viral causes. Rotavirus is the most common cause of acute gastroenteritis in young children. Vibrio cholerae causes cholera but is less likely in a developed country setting.D: Rotavirus 