**Core Concept**
The adenoids are a mass of lymphoid tissue located in the nasopharynx, and their hypertrophy can lead to nasal obstruction, recurrent otitis media, and other respiratory symptoms. Effective treatment requires addressing the underlying causes of hypertrophy, which may include infection, allergy, or anatomical obstruction.

**Why the Correct Answer is Right**
Adenoid hypertrophy is often treated with adenoidectomy, which involves surgical removal of the adenoid tissue. This procedure is effective in relieving symptoms such as nasal obstruction and recurrent otitis media. Adenoidectomy can be performed using various techniques, including electrocautery, laser, or cold steel. In some cases, adenoidectomy may be combined with tonsillectomy or other procedures to address related conditions.

**Why Each Wrong Option is Incorrect**
**Option A:** Antibiotics are not effective in treating adenoid hypertrophy, as this condition is not caused by a bacterial infection. While antibiotics may be used to treat secondary infections, they do not address the underlying cause of adenoid hypertrophy.
**Option B:** Nasal decongestants may provide temporary relief from nasal obstruction symptoms, but they do not address the underlying cause of adenoid hypertrophy and may not be effective long-term.
**Option C:** Allergies can contribute to adenoid hypertrophy, but treating allergies with medications such as antihistamines or corticosteroids does not address the underlying adenoid tissue and may not provide significant relief from symptoms.

**Clinical Pearl / High-Yield Fact**
Adenoid hypertrophy is often associated with enlarged tonsils, and some studies suggest that adenoidectomy may be more effective when combined with tonsillectomy in relieving symptoms.

**Correct Answer:** A. Antibiotics.