**Core Concept**
Conjunctivitis is an inflammation of the conjunctiva, a thin membrane covering the white part of the eye and the inner surface of the eyelids. It can be caused by various factors, including infections, allergies, and irritants.

**Why the Correct Answer is Right**
The correct answer is related to the fact that conjunctivitis is characterized by specific clinical features, such as redness, swelling, and discharge of the conjunctiva. The condition can be classified into several types, including viral, bacterial, and allergic conjunctivitis. Each type has distinct clinical features and management strategies.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because conjunctivitis can indeed be associated with foreign body sensation, which is a common symptom of the condition.

**Option B:** This option is incorrect because conjunctivitis often presents with photophobia, which is a common complaint of patients with this condition.

**Option C:** This option is incorrect because conjunctivitis can be caused by a variety of factors, including viral, bacterial, and allergic reactions, all of which can lead to tearing.

**Clinical Pearl / High-Yield Fact**
It's essential to distinguish between viral and bacterial conjunctivitis, as the latter requires antibiotic treatment, whereas viral conjunctivitis is typically self-limiting and requires supportive care. A useful mnemonic to remember the common causes of conjunctivitis is "Viral-Vascular-Bacterial-Allergic" (VVBA).

**Correct Answer: D.**