What is the name of the fungus that causes ringworm infections?

The fungus that causes ringworm infections is indeed called Trichophyton. This genus encompasses several species that are responsible for a variety of dermatophyte infections, including tinea (commonly known as ringworm). Trichophyton thrives in warm, moist environments and can infect the skin, hair, and nails, leading to the characteristic circular rash associated with ringworm.

In contrast, Candida is primarily known for causing yeast infections and opportunistic infections in immunocompromised individuals. Aspergillus is a mold that can lead to respiratory issues and other serious infections, typically affecting those with weakened immune systems. Cryptococcus is another pathogen frequently associated with infections, particularly in individuals with compromised immunity, but it does not cause ringworm. Thus, Trichophyton is the correct answer due to its specific association with ringworm infections.