question: Q:A 9-year-old boy is brought to the pediatrician by his parents with a fever, cough, and cold symptoms that began 7 days ago. He has been complaining of right ear pain for the last 2 days. He is otherwise a completely healthy child with no known medical conditions. On physical examination, the temperature is 39.0°C (102.2°F), the pulse is 114 /min, the blood pressure is 106/74 mm Hg, and the respiratory rate is 26/min. On chest auscultation, rales are heard over the right subscapular region accompanied by bronchial breathing in the same region. Examination of the right external auditory canal reveals an erythematous, bulging tympanic membrane. The results of a complete blood count are as follows:
  Hemoglobin % 11 g/dL
  WBC count 12,000/mm3
  Neutrophils 88%
  Lymphocytes 10%
  Monocytes 2%
  Platelet count 200,000/mm3
  A chest radiograph shows a focal homogenous opacity in the right lung suggestive of consolidation. Bacteriologic cultures of the blood, nasopharynx, and sputum grew Moraxella catarrhalis. Which of the following is the antibiotic of choice?? 
  {'A': 'Cefadroxil', 'B': 'Cephalexin', 'C': 'Doxycycline', 'D': 'Linezolid', 'E': 'Trimethoprim-sulfamethoxazole'},