<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 7-year-old boy presents to the emergency department with several days of high fever accompanied by runny nose, cough, and red itchy eyes. Upon further history, you learn that the family is undocumented and has not had access to primary health services. Upon physical examination you see a red, slightly bumpy rash extending from the head to the mid-chest level. If you had examined this child a prior to the development of the rash, which of the following signs may you have observed?? A: Parotid gland swelling, B: Posterior auricular lymphadenopathy, C: Blueberry muffin rash, D: Dermatomal vesicular rash, E: Koplik spots,  <response>: This is a clinical vignette describing a 7-year-old boy with fever, upper respiratory symptoms, and a rash. The question is asking which physical exam finding would have been present before the rash developed. Based on the description of high fever, runny nose, cough, and red eyes, this is likely a viral infection. The rash extending from the head down is suggestive of a generalized viral exanthem. The key to this question is realizing the rash developed after the initial presentation. We need to think about what early physical exam findings would have been present before the rash.E: Koplik spots 