Which agent is specifically used to destroy fungi?

The correct choice is fungicide, as it refers specifically to agents designed to kill fungi. Fungicides can be utilized in various contexts, including medical treatments and agricultural practices, to target and eliminate fungal infections or infestations. This specificity in function makes fungicides essential in situations where fungal pathogens pose a risk to health or crops.

While antifungal agents also aim to treat or prevent fungal infections, they are a broader category that includes not just killing fungi but also inhibiting their growth. In contrast, fungicide emphasizes the lethal aspect of such agents. The other terms, such as bacteriocidal and disinfectant, pertain to the elimination of bacteria and the process of cleansing surfaces or objects, respectively, and do not specifically target fungi. Thus, fungicide is the most precise term for agents that destroy fungi.