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.

[Q]: Question: What is the main cause of functional urinary incontinence in the elderly? 
 Options:  <0> Detrusor instability. <1> Obstruction due to fecalomas. <2> Laxity of the muscles of the pelvic floor. <3> Environmental barriers. <4> Urinary retention induced by medication.
[A]: nursery


[Q]: Question: Aflatoxin B1 is a natural product that owes its toxicity to a product of its metabolism, very reactive, of the nature of: 
 Options:  <0> 1,2-Diol. <1> Quinonymine <2> Epoxide <3> Α, β-unsaturated carbonyl. <4> Radical hydroperoxide.
[A]: pharmacology


[Q]: Question: What author proposes that the structure and functions of the personality are organized in three levels: dispositional traits, personal interests or concerns and life history? 
 Options:  <0> Pelechano <1> Singer. <2> Coast. <3> McAdams. <4> Pervin.
[A]:
psychology