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: 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: The General Law of Health (Law 14/1986, of April 25) favored the psychiatric reform in Spain because: 
 Options:  <1> It gave a letter of nature to the model of the asylum. <2> Defined the biomedical model of assistance to the psychiatric patient. <3> Institutionalized the community structure formed by interdisciplinary teams. <4> Regulated the factors and elements of the quality of care. <5> He adopted a paternalistic model of protection for the mentally ill.
[EX A]: 3

[EX Q]: Question: The humanized antibodies: 
 Options:  <1> They have very low affinity. <2> They contain CDRs of a mouse monoclonal antibody. <3> They have totally murine VH and VL domains. <4> They have totally human VH and VL domains. <5> They have human light chains.
[EX A]:
2