This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy 1, Subject name: Anatomy
[{'content': 'The most common cause of anterior vermis syndrome is _______________. \nSelect and explain. \nA. Alcohol abuse, B. An abscess, C. A tumor, D. Lead intoxication', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anterior vermis syndrome is a result of chronic alcohol abuse. Patients have dystaxia of the lower limb and trunk. Posterior vermis syndrome involves the flocculonodular lobe; it is most frequently caused by an ependymoma or a medulloblastoma. Patients have truncal dystaxia. Hemispheric syndrome usually is the result of a tumor (astrocytoma) or abscess; patients have arm, leg, trunk, and gait dystaxia.', 'role': 'assistant'}]