<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 is brought to the pediatrician with fever, diarrhea and bilateral red eye for 7 days. His parents noted that he has never had an episode of diarrhea this prolonged, but several other children at daycare had been ill. His immunization history is up to date. His vitals are normal except for a temperature of 37.5C 99F. A physical exam is significant for mild dehydration, preauricular adenopathy, and bilateral conjunctival injection with watery discharge. What is the most likely diagnosis? ? A: Rotavirus infection, B: C. difficile colitis, C: Adenovirus infection, D: Norovirus infection, E: Vibrio parahaemolyticus infection,  <response>: This is a clinical vignette describing a 4-year-old boy with fever, diarrhea, and bilateral red eyes for 7 days. The key findings are prolonged diarrhea, fever, preauricular adenopathy, and bilateral conjunctival injection with watery discharge. The differential diagnosis includes infectious causes of gastroenteritis and conjunctivitis. Rotavirus typically causes more severe vomiting than diarrhea. C. difficile colitis is unlikely in this otherwise healthy child without antibiotic exposure. Norovirus causes more vomiting than diarrhea. Vibrio infection is associated with eating raw seafood. The presence of both conjunctivitis and adenopathy makes adenovirus infection the most likely diagnosis. Adenovirus is a common cause of pharyngoconjunctival fever, which presents with fever, pharyngitis, preauricular adenopathy, and conjunctivitis.C: Adenovirus infection 