**Core Concept**
Immunoglobulins, also known as antibodies, are glycoprotein molecules that play a crucial role in the immune system by recognizing and binding to specific antigens, thereby neutralizing or removing them from the body. There are five main classes of immunoglobulins: IgA, IgD, IgE, IgG, and IgM.

**Why the Correct Answer is Right**
Immunoglobulins are produced by B lymphocytes and are essential for the body's defense against infections. They work by binding to specific epitopes on the surface of pathogens, marking them for destruction by other immune cells. The different classes of immunoglobulins have distinct structures and functions, allowing them to perform various roles in the immune response.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the correct characteristic of immunoglobulins.
**Option B:** This option is incorrect because it may be a characteristic of immunoglobulins, but it is not the most accurate or specific description.
**Option C:** This option is incorrect because it is not a well-known or accurate characteristic of immunoglobulins.

**Clinical Pearl / High-Yield Fact**
Immunoglobulins are used as a therapeutic agent in certain medical conditions, such as Kawasaki disease and autoimmune disorders, where they can help to reduce inflammation and neutralize pathogens.

**Correct Answer: IgG**