In dimorphic pathogens, which statement correctly assigns forms to temperatures?

• A. Mold/hyphal form is favored at 25°C and yeast form at 37°C
• B. Yeast form is favored at 25°C and mold form at 37°C
• C. Dimorphic fungi exist only in one form
• D. Temperature has no effect on form

Answer: (A)

Dimorphic fungi switch forms with temperature: environmental 25°C favors a mold with hyphae, while body temperature around 37°C triggers a yeast form. This mold-to-yeast transition is what allows these pathogens to exist in the environment as filaments and to thrive as yeasts inside a human host, aiding infection and survival. Therefore, the statement mold/hyphal form at 25°C and yeast form at 37°C is the correct description. The other options conflict with the established pattern, either reversing the temperatures, claiming only one form, or saying temperature has no effect.