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: If in an epidemiological study, the participating population has voluntariness as an inclusion criterion, the validity of the results are subject to a bias of: 
 Options:  <0> Information. <1> Confusion. <2> Selection. <3> Interpretation. <4> Publication.
nursery

Question: Question linked to image nº1 An 80-year-old woman is brought to the emergency department for acute abdominal pain that is accompanied by hypotension, tachycardia and fever of 38ºC. Between its antecedents it emphasizes a resection of left colon by carcinoma seven days before. After the initial resuscitation, a simple chest radiograph (shown) is performed, which is diagnostic of: 
 Options:  <0> Pneumoperitoneum <1> Intestinal obstruction. <2> Strangled crural hernia. <3> Left pneumothorax <4> Mesenteric ischemia.
medicine

Question: The number of molecules per unit cell is a structure centered on all faces is: 
 Options:  <0> A. <1> Two. <2> Three. <3> Four. <4> Six.

chemistry