**Core Concept**
Dendritic ulcers are a type of corneal ulcer caused by the herpes simplex virus (HSV), leading to corneal inflammation and vision impairment. The primary goal of treatment is to reduce viral replication, prevent further corneal damage, and promote healing.

**Why the Correct Answer is Right**
Steroids, such as topical corticosteroids, are generally contraindicated in the treatment of dendritic ulcers. This is because steroids can exacerbate the viral replication, worsen the corneal inflammation, and potentially lead to a more severe outcome. Instead, antiviral medications like Acyclovir are used to inhibit viral replication and promote healing.

**Why Each Wrong Option is Incorrect**
**Option A:** Penetrating keratoplasty is a surgical procedure that involves transplanting a healthy cornea to replace the damaged one. While it may be considered in severe cases of corneal damage, it is not a primary treatment for dendritic ulcers.
**Option B:** Acyclovir is an antiviral medication that is commonly used to treat dendritic ulcers by inhibiting HSV replication. It is a correct treatment option.
**Option D:** Debridement of the edges of the ulcer is a surgical procedure that involves removing the damaged tissue to promote healing. This can be a useful treatment option for dendritic ulcers, especially if the ulcer is large or has not responded to other treatments.

**Clinical Pearl / High-Yield Fact**
When treating dendritic ulcers, it is essential to use antiviral medications like Acyclovir, while avoiding steroids, which can exacerbate the condition.

**✓ Correct Answer: C. Steroids**