Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: A 7-year-old boy presents a subacute picture of cerebellar ataxia and intracranial hypertension. Magnetic resonance imaging demonstrates an expansive lesion in the cerebellar vérmix that captures contrast and obstructs the fourth ventricle. The most likely diagnosis is: 
 Options:  <1> Meningioma <2> Cerebellar metastasis. <3> Glioblastoma multiforme. <4> Medulloblastoma <5> Lymphoma
