instruction:
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:
Question: Why is the presence of lentigo in older people? 
 Options:  <0> Cell dehydration <1> Small hemorrhages due to capillary fragility. <2> Hyperplasia of intraepidermal melanocytes. <3> Deficiency of collagen and elastin. <4> Lipofuscin deposits.
answer:
nursery


question:
Question: What mineral deficit has been especially observed in pica cases? 
 Options:  <0> Calcium deficit <1> Zinc deficit. <2> Lead deficit <3> Potassium deficit <4> Sodium deficit
answer:
psychology


question:
Question: The first step in the folding of disordered polypetide chains is: 
 Options:  <0> Formation of the primary structure. <1> Formation of disulfide bridges. <2> Formation of aggregates. <3> Post-translational modifications. <4> Formation of secondary structure elements.
answer:

chemistry