You will be given a definition of a task first, then some input of the task.
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: At what approximate age do children begin to understand that a person may have false beliefs about the world ?:
Options: <0> At 18 months. <1> At two years. <2> At four years old <3> At six years old. <4> At eight years old.
Output:
psychology