**Question:** Sjogren syndrome affects:

**Core Concept:** Sjogren's syndrome is an autoimmune disorder characterized by lymphocytic infiltration and destruction of exocrine glands, leading to dry eyes, dry mouth, and other systemic manifestations.

**Why the Correct Answer is Right:**

* Sjogren syndrome primarily affects the salivary and lacrimal glands, leading to the classic clinical features of dry mouth (xerostomia) and dry eyes (keratoconjunctivitis sicca).
* The correct answer (C) is right because Sjogren's syndrome primarily targets the exocrine glands, specifically the salivary and lacrimal glands.

**Why Each Wrong Option is Incorrect:**

* Option A (affects the gastrointestinal tract) is incorrect because the primary involvement is in the exocrine glands, not the gastrointestinal system.
* Option B (affects the respiratory system) is incorrect because respiratory system involvement is not a hallmark feature of Sjogren's syndrome.
* Option D (affects the cardiovascular system) is incorrect as cardiovascular system involvement is not a defining feature of Sjogren's syndrome.

**Clinical Pearl:**

Sjogren's syndrome is a manifestation of an autoimmune disorder, where the immune system attacks the body's own tissues, leading to the destruction of exocrine glands and resulting in dry mouth, dry eyes, and other systemic manifestations. It is essential for medical students and practitioners to recognize this condition to provide proper diagnosis and management strategies for patients presenting with these symptoms.

**Correct Answer:** C affects the exocrine glands (salivary and lacrimal)