Which of the following is a vivotoxin?

Answer: Option C

Fusaric acid is a vivotoxin.
Vivotoxin designates a secondary metabolite produced by the pathogen and/or its host during infection, produces disease symptoms, but is not oneself the initiating causal agent of the infection.
Out of all, Fusaric-acid is the most studied pathogen-produced wilt toxin classified as a non-specific vivotoxin.