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'.

Q: Question: Which of the following conditions causes a decrease in the O2 saturation of the hemoglobin that is not due to a decrease in the partial pressure of oxygen? 
 Options:  <1> Ventilation-perfusion ratio lower than normal. <2> Anemia. <3> Carbon monoxide poisoning. <4> Hypoventilation. <5> Shunt venoarterial.

A: 3
****
Q: Question: The translocation t (11; 14) is characteristic of mantle lymphoma. Which fusion protein originates, capable of promoting the cells towards the S phase of the cell cycle ?: 
 Options:  <1> BCL-2 <2> Beta-2-microglobulin. <3> Cyclin D1. <4> Transreticulin. <5> ALK protein.

A: 3
****
Q: Question: In the survey investigations, we work with a representative sample of the population. What does this mean ?: 
 Options:  <1> The sample faithfully reflects the variables that characterize the population and its size is adequate. <2> The conclusions of the study only describe the specific sample and are not generalizable. <3> We obtain incomplete and biased information by the characteristics of the sample. <4> The basic criterion of inclusion in the sample is the accessibility of the participants. <5> The size of the sample should be as close as possible to that of the population.

A:
1
****