**Core Concept**
Bell's palsy is a form of peripheral seventh cranial nerve (facial nerve) dysfunction, resulting in unilateral facial weakness or paralysis. The treatment aims to reduce inflammation, promote nerve regeneration, and restore facial function.

**Why the Correct Answer is Right**
The treatment of choice for Bell's palsy is corticosteroids, specifically prednisone, due to their anti-inflammatory properties. Corticosteroids reduce inflammation of the facial nerve, thereby promoting nerve regeneration and improving outcomes. The initiation of corticosteroid therapy within 72 hours of symptom onset is crucial for optimal results.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as antiviral medications, such as acyclovir, have not been proven to be effective in treating Bell's palsy. They may be considered in cases where herpes simplex virus is suspected as a causative factor.
**Option B:** This option is incorrect as physical therapy or facial exercises alone are not sufficient to treat Bell's palsy. They may be used as a supplement to medical therapy but are not the primary treatment.
**Option C:** This option is incorrect as anticonvulsants, such as carbamazepine, are not typically used in the treatment of Bell's palsy. They may be considered in cases where there is a co-existing seizure disorder.

**Clinical Pearl / High-Yield Fact**
Early initiation of corticosteroids within 72 hours of symptom onset is crucial for optimal outcomes in Bell's palsy. The House-Brackmann grading system is commonly used to assess facial function in patients with Bell's palsy.

**Correct Answer: A. Corticosteroids, specifically prednisone.**