Answer: Fungi.
Step-by-step explanation:
If a person is suffering from pathogen that derives nutrition from its environment then the pathogen belongs to kingdom fungi.
In case of fungal infections, fungus release enzyme out of their body and performs extracellular digestion and absorb nutrition from their environment.
As they do not have stomach, they need to digest the food before they can pass through the cell wall into hyphae.
Such kind of pathogens are Fungi.