**Core Concept**
Aphasia is a complex cognitive disorder caused by brain damage, typically resulting from stroke or traumatic brain injury, that affects an individual's ability to communicate effectively. Comprehension in aphasia refers to the ability to understand spoken language, which is a crucial aspect of communication.

**Why the Correct Answer is Right**
Comprehension in aphasia is often impaired due to damage to the left posterior superior temporal gyrus, particularly the planum temporale, which is involved in language processing. This area is responsible for the integration of auditory and linguistic information, enabling the individual to comprehend spoken language. The planum temporale is interconnected with other language processing centers, such as Wernicke's area, which is also affected in aphasia.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the brain region responsible for comprehension in aphasia.
**Option B:** This option is incorrect because it refers to a different aspect of language processing, specifically speech production, which is impaired in apraxia of speech, not aphasia.
**Option C:** This option is incorrect because it refers to a different type of cognitive disorder, specifically attention deficit hyperactivity disorder (ADHD), which affects attention and executive function, not language processing.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the type and severity of aphasia can vary widely depending on the location and extent of brain damage. A thorough assessment of language function, including comprehension, is crucial for determining the underlying cause and developing effective treatment strategies.

**Correct Answer: D. Planum temporale**