**Core Concept**
The question requires the diagnosis of a condition characterized by autoimmune-mediated inflammation of the salivary glands, resulting in symptoms of dry mouth and dry eyes. This condition is associated with the presence of specific autoantibodies and lymphocytic infiltration on biopsy.

**Why the Correct Answer is Right**
The patient's symptoms and laboratory findings are consistent with Sjögren's syndrome, an autoimmune disorder that primarily affects the exocrine glands, particularly the salivary and lacrimal glands. The presence of autoantibodies to Ro (SS-A) is a key diagnostic criterion for Sjögren's syndrome. The lymphocytic infiltration in the salivary gland biopsy further supports this diagnosis, indicating an autoimmune-mediated inflammatory process.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a condition characterized by systemic inflammation and joint symptoms, which are not present in this patient.

**Option B:** This option is incorrect because it refers to a condition characterized by inflammation of the lacrimal gland, but it does not account for the patient's dry mouth symptoms or the presence of autoantibodies to Ro (SS-A).

**Option C:** This option is incorrect because it refers to a condition characterized by inflammation of the parotid gland, but it does not account for the patient's dry eyes symptoms or the presence of lymphocytic infiltration on biopsy.

**Option D:** This option is incorrect because it refers to a condition characterized by glandular enlargement and inflammation, but it does not account for the patient's specific symptoms or the presence of autoantibodies to Ro (SS-A).

**Clinical Pearl / High-Yield Fact**
Sjögren's syndrome is an autoimmune disorder that can be associated with other autoimmune conditions, such as systemic lupus erythematosus (SLE) or rheumatoid arthritis. Patients with Sjögren's syndrome may also be at increased risk of developing lymphoma.

**Correct Answer:** C. Sjögren's syndrome