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'.

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.
3

Question: What cognitive technique is used in Rational Emotive Behavior therapy to help people who have intellectual difficulties? 
 Options:  <1> Reduction to the absurd. <2> Cognitive distraction <3> Training in social skills. <4> Rational-emotive imagination. <5> Training in self-instructions.
5

Question: In a 60-year-old man with moderate renal insufficiency, treatment is started, without administration of loading dose, with a digitalis medication. Under these conditions, the half-life or plasma half-life of digitalis is estimated at 72 hours. Indicate how much treatment time in days should elapse from the start of treatment to reach the steady state concentration or equilibrium concentration. 
 Options:  <1> In 3 days. <2> Between 3 and 9 days. <3> Between 12 and 15 days. <4> More than 30 days <5> More than 60 days

3