Final answer:
The statement that Candida is not part of the normal biota is incorrect, as it is commonly found in various body regions including the gastrointestinal and vaginal tracts.
Step-by-step explanation:
The incorrect statement about Candida among the given options is that it is not part of the normal biota. In fact, Candida spp. are typically present in the normal microbiota in the body, including the skin, respiratory tract, gastrointestinal tract, and female urogenital system. Such yeast can become pathogenic, particularly in those who are immunocompromised, leading to conditions such as oral thrush and vaginal yeast infections. Candida is indeed a dimorphic yeast and can cause serious problems in patients with compromised immune systems.