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: To detect the occurrence of prerenal acute renal failure in a patient, the nurse should monitor the presence of: 
 Options:  <1> Signs of low cardiac output. <2> Hematuria <3> Urine cloudy and smelly. <4> Colic pain <5> Elevation of creatinine clearance.
1

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: The hormone that facilitates the reabsorption of water by the kidneys, whose absence causes loss of large amounts of water in the urine, is called: 
 Options:  <1> Oxytocin <2> Vasopressin <3> Dopamine <4> Cholecystokinin <5> Glutamate.

2