question: Q:A 20-year-old male military recruit comes to the office with complaints of a fever and a non-productive cough that started 5 days ago. He also states having pain during swallowing. He has a mild headache and pain in his left ear. He does not have any relevant past medical history. His vitals include the following: blood pressure of 120/78 mm Hg, pulse of 100/min, temperature 37.8°C (100°F), respiratory rate 14/min. Physical exam reveals a congested left tympanic membrane and rhonchi on auscultation of the right lung base. The blood test results are given below:
  Hemoglobin: 15 mg/dL
  Hematocrit: 50%
  Leukocyte count: 7,500/mm3
  Neutrophils: 67%
  Bands: 5%
  Eosinophils: 1%
  Basophils: 0%
  Lymphocytes: 28%
  Monocytes: 5%
  Platelet count: 265,000/mm3
  Low titers of cold agglutinins are detected. His chest radiograph shows poorly defined nodular opacities in the right lower lung zone. Which of the following is the most likely organism responsible for this patient’s condition?? 
  {'A': 'Staphylococcus aureus', 'B': 'Mycoplasma pneumonia', 'C': 'Streptococcus pneumoniae', 'D': 'Haemophilus influenzae', 'E': 'Chlamydia psittaci'},