In gingivitis, the immunoglobulins are consistent with the increase in number of
**Core Concept**
Gingivitis is an inflammatory condition of the gingiva, characterized by an immune response to bacterial plaque. The immunoglobulins involved in this process are primarily IgG and IgM, which are part of the adaptive immune system.
**Why the Correct Answer is Right**
In gingivitis, the increase in number of certain immunoglobulins is a response to the presence of bacterial antigens. Specifically, the levels of IgG and IgM antibodies against bacterial antigens such as Streptococcus mutans and Porphyromonas gingivalis increase in response to the bacterial plaque. These antibodies play a crucial role in the activation of the complement system and the recruitment of immune cells to the site of inflammation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as IgA is the primary immunoglobulin involved in mucosal immunity, particularly in the respiratory and gastrointestinal tracts.
**Option B:** This option is incorrect as IgE is primarily involved in allergic reactions and parasitic infections, rather than in the immune response to bacterial plaque.
**Option C:** This option is incorrect as IgD is a minor immunoglobulin class that is primarily expressed on the surface of mature B cells, where it acts as a receptor for antigens.
**Clinical Pearl / High-Yield Fact**
In gingivitis, the presence of IgG and IgM antibodies against bacterial antigens is a key indicator of the immune system's response to the bacterial plaque. This can be used as a diagnostic marker to differentiate between gingivitis and other oral health conditions.
**Correct Answer: D. IgG and IgM**