TASK DEFINITION: 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'.
PROBLEM: 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.

SOLUTION: 3

PROBLEM: Question: Due to its high mercury content, the Spanish Agency for Food Safety and Nutrition recommends pregnant women not to consume: 
 Options:  <1> Mature soft cheeses, type Brie or Camembert. <2> Pate or foie gras. <3> Large fatty fish. <4> Raw sausages <5> Green leaf vegetables.

SOLUTION: 3

PROBLEM: Question: Tα CD4 + lymphocytes: 
 Options:  <1> They are functionally cooperative with B lymphocytes and other T lymphocytes. <2> They recognize native antigens in soluble form. <3> They recognize peptides in the MHC class I context. <4> They are less abundant than CD8 + in human blood. <5> They release perforins.

SOLUTION:
1