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'.

[EX Q]: Question: A 75-year-old man who reported decreased visual acuity in his right eye of two weeks of evolution. In the fundus examination, soft drusen and serous detachment at the level of the macula are seen. What treatment is currently the most indicated for this disease? 
 Options:  <1> Focal photocoagulation with laser. <2> Photodynamic therapy. <3> Intravitreal injections of anti-angiogenic drugs. <4> Posterior vitrectomy. <5> Observation.
[EX A]: 3

[EX Q]: Question: We want to compare the means of two populations that follow normal distributions and have the same variance. We take two samples of size n1 and n2. When constructing a confidence interval we will have to calculate a value t for a Student's T distribution with: 
 Options:  <1> 2 degrees of freedom. <2> n1 + n2 - 2 degrees of freedom. <3> (n1 + n2) - 1 degrees of freedom. <4> (n1 x n2) / 2 degrees of freedom. <5> Degrees of freedom calculated with the formula of Welch or Smith-Satterwhite.
[EX A]: 2

[EX Q]: 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
[EX A]:
4