You are answering a USMLE-style medical question. Question: A 66-year-old man presents to the emergency department for a cough and fatigue. The patient was brought in from a nursing home with documentation stating that he has seemed confused for the past day according to the staff. The patient has a past medical history of diabetes and hypertension. He is currently taking insulin, metformin, lisinopril, and atorvastatin. His temperature is 102°F (38.9°C), blood pressure is 107/58 mmHg, pulse is 120/min, respirations are 15/min, and oxygen saturation is 98% on room air. Physical exam reveals crackles on pulmonary exam and S4 on cardiac auscultation. Which of the following is the next best step in management? Options: A) Azithromycin and admission to the medical floor B) Azithromycin and discharge C) Azithromycin, moxifloxacin, and admission to the intensive care unit D) Moxifloxacin and admission to the medical floor Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.