<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 20-year-old woman presents to the emergency department after developing a widespread rash when she was playing in the park. She states she feels somewhat light-headed. She is otherwise healthy and has no significant past medical history. Her temperature is 97.0F 36.1C, blood pressure is 8454 mmHg, pulse is 130min, respirations are 22min, and oxygen saturation is 95 on room air. Physical exam is notable for bilateral wheezing and a diffuse urticarial rash. Which of the following is the next best step in management?? A: Albuterol, B: Continuous monitoring, C: Diphenhydramine, D: Epinephrine, E: Normal saline,  <response>: This is a clinical vignette describing a patient with an acute allergic reaction or anaphylaxis. The key findings are a diffuse urticarial rash, lightheadedness, tachycardia, and hypotension, indicating a systemic reaction. The next best step in management is epinephrine, which is the first-line treatment for anaphylaxis. It helps reverse vasodilation and bronchospasm through alpha and beta receptor effects. Albuterol may help with wheezing but does not treat the underlying allergic reaction. Diphenhydramine is an antihistamine that blocks histamine effects but does not treat hypotension or bronchospasm. Continuous monitoring and normal saline may help support the patient but do not treat the anaphylactic reaction itself.D: Epinephrine 