A 52-year-old man comes to the physician for a 2-day history of mildly productive cough and low-grade fever. A chest x-ray is shown.
Which of the following best describes the most likely causal organism?
A) Gram-positive cocci in chains
B) Gram-positive cocci in clusters
C) Gram-positive diplococci
D) Gram-negative diplococci
E) Gram-negative rods
