Which spirochete is linked to the condition known as fusospirochetosis?

Explanation

Fusospirochetosis is primarily caused by Borrelia vincenti, a spirochete bacterium. Other options listed are associated with different diseases: Treponema pallidum causes syphilis, Treponema pertenue causes yaws, Borrelia burgdorferi is responsible for Lyme disease, and Leptospira interrogans causes leptospirosis.