___ is characterized by the triad of confusion, ataxia, and nystagmus (leading to ophthalmoplegia), though all 3 features may not always be present. The above is considered a medical emergency and requires urgent administration of ___ either intravenously or intramuscularly. a) Wernicke encephalopathy; Thiamine b) Meningitis; Antibiotics c) Cerebellar infarction; Thrombolytics d) Stroke; Aspirin