Given the task definition and input, reply with output. 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 stage is the person when they begin to balance the positive and negative consequences of drug use and, as a result, begin to consider stopping consumption, but basically maintain their ambivalence in this decisional balance?
Options: <0> Stadium of action. <1> Contemplation stadium. <2> Relapse stadium. <3> Pre-contemplation stadium. <4> Post-relapse stadium.
psychology