**Core Concept**
Vernal keratoconjunctivitis (VKC) is a chronic allergic eye disease characterized by intense inflammation of the conjunctiva and cornea, often seen in children and young adults. The condition is typically bilateral and can be associated with other allergic diseases such as asthma and atopic dermatitis.

**Why the Correct Answer is Right**
The correct answer is related to the potential complications of VKC, which can include severe corneal ulcers, band keratopathy, and even vision loss. The corneal involvement in VKC can lead to the formation of corneal ulcers due to the intense inflammatory response, which can be a serious complication if left untreated. Band keratopathy, another complication of VKC, is a condition where calcium deposits form in the cornea, leading to vision problems.

**Why Each Wrong Option is Incorrect**
**Option A:** Not a known complication of VKC.
**Option B:** While VKC can be associated with other allergic diseases, this is not a direct complication of the condition.
**Option C:** Not a recognized complication of VKC.

**Clinical Pearl / High-Yield Fact**
VKC can be challenging to diagnose and requires a high index of suspicion, particularly in children and young adults presenting with chronic eye inflammation.

**Correct Answer: C. Corneal ulcers.**