In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: Peritoneal dialysis is a depurative technique that is characterized because:
Options: <0> It is necessary to always administer heparin through the peritoneal catheter. <1> It is indicated in patients with respiratory problems of a restrictive type. <2> Does not produce significant hemodynamic alterations. <3> Requires daily and nightly solution exchanges every four hours. <4> Water and toxic substances are eliminated by ultrafiltration.
nursery