Final answer:
The broad spectrum agent that can be fungistatic or fungicidal depending on the concentration is azole and morpholine fungicides.
Step-by-step explanation:
The broad spectrum agent that can be fungistatic or fungicidal depending on the concentration is azole and morpholine fungicides. These fungicides interfere with the synthesis of membrane sterols in fungi, making them effective against a wide range of fungal pathogens. When used at a low concentration, they have a fungistatic effect, inhibiting the growth of fungi. At a higher concentration, they have a fungicidal effect, killing the fungi.
For example, miconazole is a clinical antifungal medication that belongs to the azole class of fungicides. It can be used topically for skin infections, and at a higher concentration, it can be used to treat systemic fungal infections.