Which neurological disorder is characterized by the presence of at least two unprovoked seizures?

The presence of at least two unprovoked seizures is a defining characteristic of epilepsy. This neurological disorder manifests through recurrent seizures that occur due to abnormal electrical activity in the brain. A diagnosis of epilepsy requires not just the occurrence of one seizure, but rather a pattern of seizures, emphasizing the importance of repeated episodes to distinguish it from other conditions.

Febrile seizures, which are often triggered by fever in children, do not necessarily indicate an underlying neurological condition like epilepsy. They typically resolve as the child grows and are not classified as unprovoked because they occur in the context of febrile illness.

Dystonia refers to a type of movement disorder characterized by sustained muscle contractions, which can result in twisting and repetitive movements or abnormal postures, but does not involve seizures. Multiple sclerosis is a demyelinating disease that primarily affects adults and can lead to a range of neurological deficits, but it is not characterized by seizures as a primary symptom.

Thus, the definition of epilepsy, requiring at least two unprovoked seizures, is what distinguishes it clearly in this context. This makes it the most accurate choice in relation to the question presented.