A 16-year-old girl presents to the neurology clinic with a 2-year history of early-morning bilateral arm jerks causing her to drop objects, followed occasionally by generalized tonic-clonic seizures. Her EEG shows the pattern marked **A** in the diagram — generalized polyspike-and-wave discharges activated by photic stimulation. Which of the following is the most appropriate first-line antiseizure drug for this patient?
A 16-year-old girl presents with a first generalized tonic-clonic seizure on waking. She reports morning jerks of both arms for the past year causing her to drop objects, and occasional blank stares. Seizures are triggered by sleep deprivation, alcohol, and flickering lights at a discotheque. Neurological examination and MRI are normal. EEG shows the pattern marked **B** in the diagram—generalized 4–6 Hz polyspike-and-wave discharges with photoparoxysmal response on photic stimulation. Based on this EEG finding and clinical presentation, what is the most likely diagnosis?
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