Which of the following statements is true about hapten –
**Core Concept**
A hapten is a small molecule that, on its own, is unable to induce an immune response but can bind to a larger carrier protein, becoming immunogenic and triggering an immune response.
**Why the Correct Answer is Right**
Haptens work by binding to a specific epitope on a carrier protein, which is then recognized by the immune system as foreign. This binding process allows the immune system to generate antibodies against the hapten-carrier complex. Haptens are commonly used in the development of vaccines and diagnostic tests, as they can be designed to target specific cells or tissues.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the role of haptens in immune responses. While haptens can bind to carrier proteins, they do not become immunogenic on their own.
**Option B:** This option is incorrect because it is too broad and does not specifically address the unique properties of haptens. All antigens are recognized by the immune system, but not all are haptens.
**Option C:** This option is incorrect because it implies that haptens can induce an immune response on their own, which is not true.
**Clinical Pearl / High-Yield Fact**
Haptens are an essential concept in immunology, and understanding their role in immune responses is crucial for the development of effective vaccines and diagnostic tests.
**Correct Answer: C. Haptens are small molecules that require binding to a carrier protein to become immunogenic.**