A previously healthy 48-year-old man comes to the physician because of a 2-week history of a nonpruritic rash on his right forearm. The rash began as pustules and progressed to form nodules and ulcers. He works as a gardener. Physical examination shows right axillary lymphadenopathy and the findings in the photograph. Which of the following is the most likely causal organism?

Candida species
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Aspergillus species
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Cryptococcus neoformans/gattii
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Pneumocystis jirovecii
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Mucormycoses
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Dermatophytes
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Antifungal agents
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Opportunistic fungal infections
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Parasitic life cycles
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Soil-transmitted helminths
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Filarial nematodes
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Schistosomiasis
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Echinococci and other tissue helminths
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