Question

which pathogen grows as single cells or thread - like filaments?
a fungi
b virus
c bacteria
d protozoa

Explanation:

Fungi can exist as single - celled yeasts or multicellular, thread - like filaments called hyphae. Viruses are not cells. Bacteria are single - celled but not typically in thread - like filaments. Protozoa are single - celled, but not filamentous in the same way as fungi.

Answer:

A. fungi