<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 61-year-old woman comes to the physician because of a 6-day history of cough, shortness of breath, and fever. She also reports that she has had 4 episodes of watery diarrhea per day for the last 3 days. She has chronic bronchitis. She has smoked one pack of cigarettes daily for the past 30 years. Her temperature is 39C 102.2F and pulse is 65min. Examination shows diffuse crackles over the left lower lung field. Laboratory studies show:Hemoglobin 13.8 gdLLeukocyte count 16,000mm3Platelet count 150,000mm3SerumNa 131 mEqLCl- 102 mEqLK 4.7 mEqLAn x-ray of the chest shows consolidation of the left lower lobe. A Gram stain of induced sputum shows numerous neutrophils but no organisms. Which of the following is the most appropriate pharmacotherapy?? A: Rifampin, B: Amoxicillin, C: Vancomycin, D: Levofloxacin, E: Cotrimoxazole,  <response>: This is a clinical vignette describing a 61-year-old woman with chronic bronchitis and a 30 pack-year smoking history, who now presents with cough, shortness of breath, fever, and diarrhea. She has signs of a lower respiratory infection on exam and imaging. The lab results show leukocytosis with left shift and electrolyte abnormalities consistent with dehydration from diarrhea. Sputum Gram stain shows neutrophils but no organisms. This clinical presentation is most consistent with an acute exacerbation of chronic bronchitis, likely bacterial in origin. The antibiotic choice should cover typical respiratory pathogens.D: Levofloxacin 