Final answer:
Candida albicans is a fungus that can infect the CNS, particularly in immunocompromised patients, and it requires prolonged antifungal treatment.
Step-by-step explanation:
The fungus that can infect the central nervous system (CNS) from the choices provided is B. Candida albicans. Candida albicans is a type of yeast and opportunistic pathogen that belongs to the group of fungi. When an individual is immunocompromised, Candida can cause serious infections, including affecting the CNS leading to conditions like meningitis. It is important to note that Candida albicans is not typically associated with CNS infections in individuals with a healthy immune system. It is the immunocompromised patients, such as those with AIDS, who are at a higher risk for such fungal infections of the nervous system. These infections often require prolonged treatment with antifungal drugs.