A 17-year-old boy has pus-filled cysts on his face and upper back. Microscopic examination reveals gram-positive rods. This infection is caused by
A) Acanthamoeba.
B) herpes simplex virus.
C) Propionibacterium acnes.
D) Staphylococcus aureus.
E) Streptococcus pyogenes
Answer: propionibacterium acnes
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