**Core Concept**
Rhinitis Medicamentosa is a condition characterized by rebound nasal congestion caused by the overuse of nasal decongestants. This leads to a vicious cycle of increased nasal congestion and subsequent use of decongestants, further exacerbating the condition.

**Why the Correct Answer is Right**
The treatment of Rhinitis Medicamentosa involves discontinuing the use of nasal decongestants and using saline nasal sprays or drops to help reduce nasal congestion. In some cases, oral decongestants may be used for a short duration under close supervision. The goal is to break the cycle of rebound nasal congestion and allow the nasal mucosa to return to its normal state.

**Why Each Wrong Option is Incorrect**
**Option A:** Oral corticosteroids are not the primary treatment for Rhinitis Medicamentosa, although they may be used in the treatment of underlying allergic rhinitis or other conditions causing nasal congestion.
**Option B:** Immunotherapy may be beneficial for patients with underlying allergies contributing to their nasal congestion, but it is not the primary treatment for Rhinitis Medicamentosa.
**Option C:** Nasal strips or dilators may provide temporary relief from nasal congestion, but they do not address the underlying cause of Rhinitis Medicamentosa.

**Clinical Pearl / High-Yield Fact**
Rhinitis Medicamentosa can be prevented by using nasal decongestants for the shortest duration necessary and only when absolutely necessary. It is essential to weigh the benefits of decongestants against their potential risks, especially in patients with a history of nasal congestion or other underlying respiratory conditions.

**Correct Answer: A. Discontinuing nasal decongestants and using saline nasal sprays or drops.**