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: Consider Input: Question: We want to study if Vitamin D can increase the incidence of breast cancer. In our area we have a population registry of cancer. To achieve our goal, all women diagnosed with breast cancer are selected from the register we have and each case pairs with two controls. What study design has been chosen? 
 Options:  <1> Prospective cohort study. <2> Cases and controls study. <3> Case-control study nested. <4> Retrospective cohort study. <5> Ecological study

Output: 3


Input: Consider Input: Question: In relation to vaccines, indicate the correct option: 
 Options:  <1> The immunization schedule should be suspended during the summer months. <2> The vaccination calendar is fixed and immovable. <3> The appropriate storage temperature is between 2 and 8C. <4> Influenza vaccine should only be given to people older than 14 years. <5> All the previous answers are correct.

Output: 3


Input: Consider Input: Question: Royal Decree 450/2005, of April 22, regulates: 
 Options:  <1> The Plans of Studies of Diploma in Nursing. <2> Accreditation minimums for the transformation of ATS Schools into Nursing Diploma Schools. <3> The professional competences of the Diploma in Nursing. <4> The Own Titles of Advanced Nursing. <5> The Nursing Specialties.


Output: 5