Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: What are the leaders of the Structural / Strategic School of Systemic Therapy?
Options: <1> O'Hanlon and Weiner-Davis. <2> Haley and Minuchin. <3> Weakland and Fisch. <4> Keeney and Ross. <5> Stierlin and Weber.
Output:
2