**Core Concept:**
The IgE receptor is a protein that plays a crucial role in the immune system, particularly in the context of allergic reactions. It is involved in the process of immunoglobulin E (IgE) binding to specific cells, leading to the release of inflammatory mediators and the manifestation of allergic symptoms. IgE receptors are essential for understanding the mechanisms of allergic diseases and their treatment strategies.

**Why the Correct Answer is Right:**
The correct answer is **D**, which states that IgE receptors are present on mast cells and basophils. Mast cells and basophils are part of the immune system and are involved in allergic reactions. When IgE antibodies bind to these cells, they trigger the release of preformed granules, including histamine, which leads to the typical symptoms of an allergic response.

**Why Each Wrong Option is Incorrect:**

A. This option is incorrect because IgE receptors are not present on T-cells. T-cells play a role in cellular immunity, while IgE receptors are involved in the humoral immunity aspect of the immune system.

B. This option is incorrect because IgE receptors are not present on B-cells. B-cells are involved in the production of antibodies, specifically IgG, IgA, and IgM, rather than IgE.

C. This option is incorrect because IgE receptors are not present on neutrophils. Neutrophils are part of the innate immune system and primarily function in phagocytosis and killing of pathogens, rather than participating in allergic reactions.

**Clinical Pearl / High-Yield Fact:**
Understanding the presence of IgE receptors on mast cells and basophils is essential in understanding allergic reactions and their clinical management. Knowledge of this fact helps in differentiating between allergic and non-allergic reactions and guiding appropriate treatment strategies for patients with allergic diseases.