Which of the following is NOT a type of pathogen?

The correct choice is glucose because it is not an infectious agent or pathogen. Rather, glucose is a simple sugar and a vital energy source for cells, playing a crucial role in metabolism. Pathogens are organisms or agents that cause disease, and they include viruses, prions, and bacteria.

Viruses are microscopic infectious agents that can only replicate within a host's living cells, causing various diseases. Prions are misfolded proteins that can induce misfolding in other proteins, leading to neurodegenerative disorders. Bacteria are single-celled organisms that can be pathogenic or beneficial, but many species are known to cause infections and diseases. Since glucose does not fit the definition of a pathogen, it is the correct answer to the question.