<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 10-year-old boy is brought to the emergency room after a fall from a horse. He has severe pain in his right forearm. He has a history of asthma and atopic dermatitis. His current medications include an albuterol inhaler and hydrocortisone cream. Examination shows an open fracture of the right forearm and no other injuries. The patient is given a parenteral infusion of 1 L normal saline, cefazolin, morphine, and ondansetron. The right forearm is covered with a splint. Informed consent for surgery is obtained. Fifteen minutes later, the patient complains of shortness of breath. He has audible wheezing. His temperature is 37.0C 98.6F, heart rate is 130min, respiratory rate is 33min, and blood pressure is 8054 mm Hg. Examination shows generalized urticaria and lip swelling. There is no conjunctival edema. Scattered wheezing is heard throughout both lung fields. Which of the following is the most appropriate next step in management?? A: Administer intravenous diphenhydramine, B: Administer vancomycin and piperacillin-tazobactam, C: Administer intravenous methylprednisolone, D: Administer intramuscular epinephrine, E: Endotracheal intubation,  <response>: This is a clinical vignette describing a 10-year-old boy who developed an allergic reaction after receiving medications for a broken arm. The reaction included shortness of breath, wheezing, urticaria hives, and lip swelling. This is most consistent with anaphylaxis, likely triggered by one of the medications he received. The answer choices include medications to treat an allergic reaction diphenhydramine, methylprednisolone, epinephrine as well as antibiotics vancomycin and piperacillin-tazobactam and intubation. The most urgent step is to administer epinephrine to treat the anaphylaxis and bronchospasm. Antihistamines and steroids are second-line. There is no indication for antibiotics or intubation at this time.D: Administer intramuscular epinephrine 