**Core Concept**
Absence seizures, previously known as petit mal seizures, are a type of epilepsy characterized by brief, sudden lapses in consciousness. They are typically seen in children and adolescents and are often associated with a genetic predisposition.

**Why the Correct Answer is Right**
Absence seizures are marked by a sudden loss of consciousness, which can last from a few seconds to a minute. During this time, the individual may stare blankly into space, blink, or even perform repetitive movements such as hand clenching or lip smacking. The seizure typically ends as suddenly as it began, leaving the individual confused but without any lasting effects.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because absence seizures are indeed characterized by a sudden loss of consciousness, which is a hallmark feature of this type of seizure.
**Option B:** This option is incorrect because absence seizures can be triggered by certain stimuli, such as flashing lights or sudden noises, which can cause a seizure to occur.
**Option C:** This option is incorrect because absence seizures are often associated with a specific EEG pattern, known as a 3 Hz spike-and-wave discharge, which is a characteristic feature of this type of seizure.

**Clinical Pearl / High-Yield Fact**
One key feature of absence seizures is that they are often difficult to diagnose, as the individual may appear to be simply daydreaming or staring blankly into space. However, if the individual is asked to perform a task or complete a sentence, they may suddenly stop and stare blankly, revealing the true nature of the seizure.

**Correct Answer:** D.