Acute onset pneumonia: Laboratory Identification

Question

The patient was admitted to the hospital. The sputum specimen was inoculated to sheep blood agar. Based on the colony morphology seen in the accompanying photograph, the most likely identification is:

Please select the single best answer

Streptococcus pneumoniae

viridans streptococcus

Streptococcus pyogenes

Streptococcus agalactiae

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