Answer:
Option). Langerhans cells transport harmful substances to white blood cells.
Step-by-step explanation:
An immune response can be defined as a reaction of cells and components of body against the foreign or abnormal substances. Langerhans cells are cells of epithelial membrane of digestive, urogenital, and respiratory tracts.
Langerhans cells represent a type of dendritic cells. Dendritic cells are immune cells that process and represent the antigen or their components on cell surface to the T cells.
Hence, transport of harmful substances by Langerhans cells to the T cells (white blood cells) is an example of immune response.
Thus, the correct answer is second option.