**Core Concept**
The patient's condition is likely an allergic conjunctivitis, which is an allergic reaction to environmental allergens such as pollen, causing inflammation and symptoms like itching, redness, and discharge. The repeated occurrence over the same time period each year suggests a seasonal allergy.

**Why the Correct Answer is Right**
The correct answer is likely a mast cell stabilizer, which prevents the release of histamine and other mediators from mast cells, thereby reducing allergic symptoms. In this case, the patient's allergic conjunctivitis is likely caused by the release of histamine and other mediators in response to pollen exposure.

**Option A:** This option is likely a corticosteroid, which can reduce inflammation but may not address the underlying allergic mechanism. Corticosteroids can be effective in reducing symptoms but may have side effects with prolonged use.
**Option B:** This option may be an antihistamine, which can block histamine receptors and provide relief from itching and other symptoms. However, antihistamines may not be as effective in reducing inflammation and may have sedative effects.
**Option C:** This option may be an antibiotic, which is not indicated for allergic conjunctivitis as it is caused by an allergic reaction rather than a bacterial infection.

**Clinical Pearl / High-Yield Fact**
Mast cell stabilizers are a good choice for treating allergic conjunctivitis as they can prevent the release of histamine and other mediators, reducing symptoms and inflammation. Examples of mast cell stabilizers include ketotifen and lodoxamide.

**Correct Answer:**. **Correct Answer:** C.