Task: Text Categorization
Input (English): Question: In the context of the analysis of the factors that influence the outcome of psychotherapy, state which of the following can be considered a specific (technical) factor (versus other types of factors, such as, for example, extra-therapeutic change, common factors): 
 Options:  <0> Placebo effect. <1> Promote successful experiences in the course of therapy. <2> Establishment of a relationship of trust. <3> Use of empathy. <4> The economy of chips.
Output (English): psychology