Which of the following is not a type of dilutant, filler, or bulking agent used in formulations?

Maltodextrin is indeed commonly used as a diluent, filler, or bulking agent in various pharmaceutical formulations. This polysaccharide is derived from starch and is frequently utilized for its ability to provide bulk and improve the texture of dosage forms. It is favored for its good solubility and ability to enhance the flow properties of powder formulations.

In contrast, the other agents listed are well-established diluents or fillers in pharmaceutical formulations. Sugars, such as sucrose or glucose, are also used not only for their sweetening properties but also as bulking agents. Celluloses are widely used for their thickening and bulking properties in both solid and liquid dosage forms. Inorganic salts can also serve as fillers or bulking agents, contributing to the overall volume and stability of specific formulations.

Thus, the correct distinction here emphasizes the role of maltodextrin as a legitimate diluent, while highlighting a misunderstanding related to its categorization. In this context, it's important to recognize that all listed materials (including maltodextrin) are indeed appropriate agents for use in formulations, which leads to reconsidering the nature of the question regarding the classification of these substances.