Final answer:
Blastomycosis is caused by the fungus Blastomyces dermatitidis and can lead to lung and skin infections, with potentially fatal outcomes if disseminated, especially in immunocompromised individuals. The correct option is B. Fungus.
Step-by-step explanation:
Blastomycosis is a disease caused by the dimorphic fungus Blastomyces dermatitidis. This organism is found in the soil, where it can release spores that may be inhaled by human beings, particularly when the soil is disturbed.
The most common form of blastomycosis affects the lungs, presenting symptoms similar to a mild flu, and can be self-limiting in healthy individuals.
However, in immunocompromised patients, the infection may disseminate and lead to chronic cutaneous disease, characterized by subcutaneous lesions primarily on the face and hands.
These lesions can become crusty and discolored over time, potentially resulting in scarring. Without treatment, systemic blastomycosis can be fatal. The correct option is B. Fungus.