<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 36-year-old man comes to the physician for a routine health maintenance examination. He has a 20-year history of seizure disorder characterized by sudden-onset, periodic, jerking movements of both arms and lip smacking. He has a history of intravenous cocaine use. His temperature is 37.1C 98.8F, pulse is 80min, respirations are 13min, and blood pressure is 13075 mm Hg. Examination shows gingival tissue covering the upper third of the teeth. There is bleeding of the gums when touched with a fine instrument. The remainder of the examination shows no abnormalities. Which of the following is the most likely cause of this patients symptoms?? A: Phenytoin, B: Carbamazepine, C: Topiramate, D: Nifedipine, E: Phenobarbital,  <response>: This is a clinical vignette describing a 36-year-old man with a 20-year history of seizure disorder characterized by sudden-onset jerking movements and lip smacking. He has a history of IV cocaine use. On exam he has gingival hyperplasia covering the upper third of his teeth with bleeding when touched. The question asks for the most likely cause of his symptoms. His seizures are likely due to his cocaine use. Cocaine can lower the seizure threshold. The gingival hyperplasia and bleeding gums point towards the use of an antiepileptic medication known to cause this side effect. Of the choices given, phenytoin is known to frequently cause gingival hyperplasia and bleeding. The other antiepileptics listed are less likely to cause this degree of gingival changes. Nifedipine is a calcium channel blocker used for hypertension, not seizures.A: Phenytoin 