The tube to the left is a slant of esculin medium, the tube to the right contains heart infusion broth with 6.5% sodium chloride. The bacterial species characteristically producing the positive reactions seen in each of these tubes is most likely:

The tube to the left is a slant of esculin medium, the tube to the right contains heart infusion broth with 6.5% sodium chloride. The bacterial species characteristically producing the positive reactions seen in each of these tubes is most likely:
A . Staphylococcus aureus
B. Streptococcus bovis
C. Enterococcus faecalis
D. Listeria monocytogenes

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Answer: A