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': 'Anticonvulsant causing visual field contraction is: \nSelect and explain. \nA. Vigabatrin, B. Levetiracetam, C. Ethosuximide, D. Phenytoin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vigabatrin can cause visual field contraction, production of behaviour changes,depression or psychosis as adverse effects. REF KD TRIPATHI 8TH ED.', 'role': 'assistant'}]