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: Proton pump inhibitor drugs are useful in the treatment of: 
 Options:  <0> Constipation. <1> Corneal ulcer. <2> Peptic ulcer. <3> Traveler's diarrhea. <4> Crohn's disease.
nursery

Question: When training a patient to perform diaphragmatic breathing exercises correctly, we will indicate that: 
 Options:  <0> Inhale through your nose while counting to 3 and exhale quickly with pursed lips. <1> Inhale through the mouth and contract the abdominal muscles for another 7 seconds. <2> Firmly press the abdomen out and down when exhaling. <3> Inhale slowly and deeply through the nose and push the abdomen outward. <4> Help yourself by supporting your hands on the rib cage while inspiring.
nursery

Question: Which of these characteristics do bacterial exotoxins have ?: 
 Options:  <0> They have all the Gram negative bacteria. <1> They are lipidic in nature. <2> They are located in the outer membrane. <3> They introduce a weak immune response. <4> Some are used inactivated as a vaccine.

pharmacology