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: Which compound acts as a sulfhydryl buffer and as an antioxidant? 
 Options:  <0> Glycogen <1> Glutamic acid. <2> Glucagon. <3> Glutathione <4> Ascorbic acid.
chemistry

Question: The following may occur in multimeric form associated with the J chain: 
 Options:  <0> IgA and IgG. <1> IgD and IgM, <2> IdE and IgD. <3> IgA and IgD. <4> IgA and IgM.
biology

Question: Which of the following statements regarding constipation in the terminal patient is correct ?: 
 Options:  <0> It is a rare symptom. <1> Its most common cause is the administration of opioids. <2> The basic therapy will consist in the administration of enemas. <3> Its etiology is unifactorial. <4> It must be treated with a diet rich in fiber.

nursery