<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 51-year-old man is undergoing chemotherapy treatment for a rapidly progressive newly-diagnosed acute myelogenous leukemia. On day 4 of his hospitalization, the patient is noted to be obtunded. Other than the chemotherapy, he is receiving lansoprazole, acetaminophen, and an infusion of D50.9 normal saline at 50 mLh. On examination, the patients blood pressure is 9450 mm Hg, heart rate is 52min, and respiratory rate is 14min. The patient appears weak but is in no acute distress. Chest auscultation reveals bibasilar crackles and scattered wheezing. His abdomen is soft, non-distended, and with a palpable liver and spleen. His ECG shows peaked T waves and widened QRS complexes. What is the best next step in the management of this patient?? A: Glucagon, B: Subcutaneous regular insulin, C: Polystyrene sulfonate, D: Calcium chloride, E: Atropine,  <response>: This is a clinical vignette about a patient with acute myelogenous leukemia undergoing chemotherapy who is now obtunded and found to be hypotensive. The key findings are chemotherapy-induced myelosuppression, mental status changes, hypotension, bradycardia, and ECG changes consistent with hyperkalemia peaked T waves, widened QRS. The question is asking for the best next step in management. Based on the clinical picture, the patient likely has chemotherapy-induced tumor lysis syndrome leading to severe hyperkalemia. The urgent priority is to treat the life-threatening hyperkalemia. Of the choices given, calcium chloride is the best option as it will stabilize the myocardial membrane and reduce the risk of fatal arrhythmias from hyperkalemia. Glucagon, insulin, and polystyrene sulfonate do not act quickly enough. Atropine may increase the heart rate but does not treat the underlying cause.D: Calcium chloride 