Final answer:
Nosocomial urinary tract infections are commonly caused by bacteria, but not by Candida which is a type of fungus.
Step-by-step explanation:
Nosocomial urinary tract infections, which are infections acquired in a healthcare setting, are commonly caused by bacteria such as Candida, Klebsiella, Pseudomonas, and Proteus. However, Candida is not a bacteria, it is a type of fungus. Therefore, the correct answer is A. Candida. The other options, B. Klebsiella, C. Pseudomonas, and D. Proteus, are all bacteria that can cause nosocomial urinary tract infections.