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'.

Let me give you an example: Question: A 13-year-old girl is operated on due to Hirschsprung illness at 3 months of age. Which of the following tumors is more likely to be present?
Options: <1> Abdominal neuroblastoma <2> Wilms tumor <3> Mesoblastic nephroma <4> Familial thyroid medullary carcinoma.
The answer to this example can be: 2
Here is why: The answer to the given question should be a tumor, therefore Wilms tumor is the correct answer for the given question.

OK. solve this:
Question: In the psychological treatment of recurrent childhood nightmares:
Options: <1> The parents are trained to extinguish, ignoring them, the manifestations of anxiety of the child who has suffered a nightmare. <2> The main objective is to ensure the physical safety of the child. <3> Exposure techniques and systematic desensitization are considered well-established treatments. <4> The technique of review in imagination is the one that has received the greatest empirical support. <5> There are no studies about the therapeutic efficacy of hypnosis.
Answer:
4