Instructions: 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: For what purpose is the muscle tension technique applied in the treatment of blood phobia used ?:
Options: <1> As a relaxation technique. <2> To divert the patient's attention from the feared stimulus. <3> To accelerate the habituation process. <4> To reduce vasovagal symptoms. <5> It is used in the first sessions to reduce anticipatory anxiety.
Output:
4