**Core Concept**
Type I hypersensitivity, also known as immediate hypersensitivity, is a type of allergic reaction that involves the release of histamine and other chemical mediators from mast cells, leading to symptoms such as hives, itching, and difficulty breathing. This reaction is mediated by IgE antibodies, which bind to allergens and trigger the release of histamine.

**Why the Correct Answer is Right**
The treatment of Type I hypersensitivity involves the administration of antihistamines, corticosteroids, and bronchodilators to alleviate symptoms. Antihistamines, such as diphenhydramine, block the action of histamine on its receptors, thereby reducing symptoms like itching and hives. Corticosteroids, such as prednisone, reduce inflammation and swelling, while bronchodilators, such as albuterol, help to open up airways in the lungs.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not address the pathophysiology of Type I hypersensitivity. While antibiotics may be used to treat secondary infections, they do not treat the underlying allergic reaction.
* **Option B:** This option is incorrect because immunosuppressive agents, such as cyclosporine, are used to treat autoimmune disorders, not Type I hypersensitivity.
* **Option C:** This option is incorrect because beta blockers, such as propranolol, are used to treat conditions like hypertension and angina, not Type I hypersensitivity.

**Clinical Pearl / High-Yield Fact**
In addition to antihistamines, corticosteroids, and bronchodilators, epinephrine auto-injectors, such as EpiPen, are used to treat anaphylaxis, a life-threatening form of Type I hypersensitivity.

**Correct Answer: A. Antihistamines**