This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'Relatively safe drug for epileptic patients in pregnancy? \nSelect and explain. \nA. Carbamazepine, B. Phenobarbitone, C. Valproate, D. Phenytoin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Barbiturates are relatively safe in pregnancy for epilepsy. Lamotrigine, Levetiracetam, topiramate are also relatively safe teratogencity ladder levetiacetam,lamotrigine>phenobarbitone ,phenytoin>carbamazepine,topiramate>valproate Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]