You observe large ( > 10 micrometer) oval cells in a sputum sample from a patient. your culture of the sample reveals fuzzy filamentous colonies. you conclude that you contaminated the sample the patient has an infection caused by a dimorphic fungus the patient has an infection with unusual algae the patient has a yeast infection the patient has a protozoan infection

The answer is "the patient has an infection caused by a dimorphic fungus".  Dimorphic fungi are those parasites that exist either in yeast frame or as a shape contingent upon ecological conditions, physiological states of the organism or the hereditary attributes. 
Some dimorphic fungi will change to yeast or shape frame contingent upon the common temperature. These organisms are alluded to as thermally dimorphic. Others will change to yeast in the event that they develop inside host tissues.

The answer is b. hope this !