A Student Is Preparing to Give Phenobarbital for Seizure Control

A student is preparing to give phenobarbital for seizure control. Her instructor asks her how this medication works to control seizures. What response by the student is the most appropriate?

A) "The pill helps to decrease the calcium in the brain, which is responsible for seizures."
B) "This medication increases a chemical called GABA that calms down the excitability in the brain that causes seizures."
C) "Phenobarbital increases a chemical called glutamate, which calms down the excitability in the brain that causes seizures."
D) "It helps by decreasing the sodium in the brain, which is responsible for the seizures."