The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following drugs is least efficacious in the treatment of temporal lobe epilepsy?   (A) Phenobarbitone   (B) Phenytoin sodium   (C) Primidone   (D) Carbamazepine
['(C) Primidone <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Phenobarbitone \n (B) Phenytoin sodium \n (C) Primidone \n (D) Carbamazepine <> possible answers', '  Which of the following drugs is least efficacious in the treatment of temporal lobe epilepsy? <> context@']