Auniversity student who is agitated and restless and has tremors is brought to the emergency department. the patient

I had this question before. It's seizures. 

In large doses, caffeine produces nervousness and tremors; in very large doses, it can cause seizures. This patient has been drinking concentrated energy drinks which are high in caffeine. Caffeine is a stimulant and produces CNS excitation, not depression. Although cardiac side effects are common with caffeine, cardiac arrest is not. Respiratory failure is not an effect of caffeine toxicity.

The answer is b. hope this !