**Core Concept**
A panic attack is a discrete episode of intense fear or discomfort that peaks within minutes and includes physical and cognitive symptoms, often without an identifiable trigger. It is a hallmark symptom of panic disorder, which is characterized by recurrent panic attacks.

**Why the Correct Answer is Right**
The patient's symptoms, such as palpitations, sweating, apprehension, and fear of impending death, are classic indicators of a panic attack. These symptoms are thought to be mediated by an overactive amygdala, which leads to the release of stress hormones like adrenaline. The patient's sudden onset of symptoms and lack of identifiable trigger also support a diagnosis of a panic attack.

**Why Each Wrong Option is Incorrect**
* **Option A:** Hysteria is an outdated term that was previously used to describe anxiety disorders, but it is no longer considered a valid diagnosis in modern psychiatry. The patient's symptoms are more specific to a panic attack than hysteria.
* **Option B:** Generalized anxiety disorder (GAD) is characterized by excessive and persistent worry about everyday things, but it does not typically involve the sudden onset of intense fear or discomfort that is characteristic of a panic attack.
* **Option C:** Cystic fibrosis is a genetic disorder that affects the respiratory and digestive systems, and it is not typically associated with sudden onset palpitations or anxiety symptoms.

**Clinical Pearl / High-Yield Fact**
Panic attacks can often be triggered by specific situations or stimuli, such as public speaking or enclosed spaces, and can be treated with medications like benzodiazepines or antidepressants, as well as cognitive-behavioral therapy.

**Correct Answer:**
✓ Correct Answer: D. Panic attack