**Core Concept:**
Pure word aphasia is a type of language disorder characterized by the selective inability to understand or produce words, while other language functions remain intact. This condition typically results from damage to the dominant hemisphere, particularly the left hemisphere, which controls language functions in typically- يمين-handed individuals.

**Why the Correct Answer is Right:**
In pure word aphasia, the individual can comprehend words and sentences but has difficulty producing them. This is due to the selective damage to the Broca's area, a region located in the posterior part of the left frontal lobe, which is crucial for speech production. While the other language functions, such as comprehension and reading, remain intact because they are controlled by the Wernicke's area, located in the left temporal lobe, and the arcuate fasciculus, which connects Broca's and Wernicke's areas.

**Why Each Wrong Option is Incorrect:**
A. The inability to comprehend words is not a feature of pure word aphasia, as this condition affects speech production.
B. The inability to read is not a feature of pure word aphasia, as reading is controlled by Wernicke's area, which is not affected in this condition.
C. The inability to write is not a feature of pure word aphasia, as writing relies on Broca's area and the arcuate fasciculus, which are affected in this condition.
D. The inability to comprehend sentences is not a feature of pure word aphasia, as comprehension is controlled by Wernicke's area and is preserved in this condition.

**Clinical Pearl:**
Understanding the anatomy and function of the language areas in the brain is crucial for diagnosing and treating language disorders. A thorough neuropsychological assessment, including language tests, is essential for making an accurate diagnosis and providing appropriate intervention for patients with aphasia.

**Correct Answer:** D. The inability to comprehend sentences is not a feature of pure word aphasia, as comprehension is controlled by Wernicke's area and is preserved in this condition.