Final answer:
The SICCT test is an example of D) Type IV hypersensitivity, which is a T-cell-mediated immune response characterized by a delayed reaction, typically occurring 24 to 72 hours after antigen exposure.
Step-by-step explanation:
The SICCT test, or Single Intradermal Comparative Cervical Tuberculin test, is an example of Type IV hypersensitivity. This type of hypersensitivity is distinct because it is not mediated by antibodies but by T cells, particularly sensitized T-helper cells (Th1) and cytotoxic T cells. During a Type IV hypersensitivity reaction, when a person is exposed to an antigen for the second time, the sensitized T cells release cytokines that recruit macrophages and other phagocytes to the site of antigen exposure. This cell-mediated response causes the delayed reaction characteristic of Type IV hypersensitivity, typically developing 24 to 72 hours post-exposure.