## Core Concept
The question pertains to the treatment response of symptoms of schizophrenia to medication. Schizophrenia is a chronic mental health disorder characterized by disruptions in thought processes, perceptions, and emotional responsiveness. Symptoms include hallucinations, delusions, disorganized thinking, and negative symptoms such as apathy and social withdrawal.

## Why the Correct Answer is Right
Positive symptoms of schizophrenia, such as hallucinations and delusions, tend to respond quickly to antipsychotic medication. These symptoms are termed "positive" because they are present in individuals with schizophrenia but not in healthy individuals, as opposed to negative symptoms which involve a diminution or absence of normal behaviors. Antipsychotic medications, particularly the second-generation antipsychotics, work by blocking dopamine receptors in the brain, which is thought to help alleviate positive symptoms.

## Why Each Wrong Option is Incorrect
**Option A:** Negative symptoms, such as apathy and social withdrawal, do not respond as quickly to antipsychotic medication and are often more challenging to treat.
**Option B:** Cognitive symptoms, while important, are not typically highlighted as responding "quickly" to treatment in the same way positive symptoms do.
**Option C:** This option is not provided, but presumably, it could refer to another aspect of schizophrenia symptoms.

## Clinical Pearl / High-Yield Fact
A key point to remember is that positive symptoms (e.g., hallucinations, delusions) of schizophrenia are more likely to show a rapid response to antipsychotic medications compared to negative symptoms (e.g., apathy, social withdrawal). Clinicians often use the response of positive symptoms to guide the initial treatment approach.

## Correct Answer: D. Positive symptoms.