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: It has a recessive inheritance linked to the X chromosome the:
Options: <1> Acatalasemia <2> Hemophilia A. <3> Rett syndrome. <4> Cystic fibrosis, <5> Hypophosphatemia
[EX A]: 2

[EX Q]: Question: What kind of validity does the degree of confidence refer to, with which it can be inferred that the cause-effect relationships between the variables of an investigation are interpretable in the sense suggested by the researcher?
Options: <1> Internal validity <2> External validity <3> Discriminant validity <4> Ecological validity <5> Construct validity
[EX A]: 1

[EX Q]: Question: Point out the correct definition:
Options: <1> The Necessary Number to Treat (NNT) is the inverse of the Relative Risk (RR). <2> The Relative Risk Reduction (RRR) can clearly differentiate the big risks and benefits of the small ones. <3> The Relative Risk Reduction (RRR) is a measure of the therapeutic effort that clinicians and patients must make to avoid negative results of their illnesses. <4> The Number Necessary to Damage (NND) is calculated by dividing the unit by the Number Needed to Treat (NNT). <5> The Absolute Risk Reduction (RRA) is calculated by the absolute difference of the episode rate in the control group minus the episode rate in the intervention group.
[EX A]:
5