**Core Concept**
Epithelial xerosis of the conjunctiva refers to a condition characterized by dryness and scaling of the conjunctival epithelium. This condition is often associated with a decrease in tear production or an imbalance in the tear composition.

**Why the Correct Answer is Right**
Epithelial xerosis of the conjunctiva is commonly caused by aqueous tear deficiency, particularly in Sjögren's syndrome, where there is a reduction in tear production due to autoimmune destruction of the lacrimal gland. The absence of sufficient tears leads to dehydration of the conjunctival epithelium, resulting in xerosis. Additionally, the conjunctival epithelium's natural barrier function is compromised, leading to increased susceptibility to infections and other ocular surface disorders.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not directly relate to the pathophysiology of epithelial xerosis of the conjunctiva. While inflammation can be a contributing factor, it is not the primary cause of this condition.
**Option B:** This option is incorrect because it is more related to the treatment of dry eye syndrome rather than its cause. Artificial tears can provide temporary relief but do not address the underlying issue of aqueous tear deficiency.
**Option C:** This option is incorrect because it describes a different condition altogether. Blepharitis is an inflammation of the eyelids and is not directly related to the dryness of the conjunctival epithelium.

**Clinical Pearl / High-Yield Fact**
It's essential to distinguish between aqueous tear deficiency and evaporative dry eye syndrome, as they require different treatment approaches. Aqueous tear deficiency is often an indication of an underlying systemic condition, such as Sjögren's syndrome, whereas evaporative dry eye syndrome is typically related to meibomian gland dysfunction.

**Correct Answer:** D.