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'.

Ex Input:
Question: The clinical sensitivity of an analytical parameter (test) is defined as: 
 Options:  <1> The mean concentrations of this test in healthy patients. <2> A pathological concentration of the test in the presence of the disease. <3> A pathological concentration of the test in the absence of the disease. <4> A normal concentration of the test in the absence of the disease. <5> A normal concentration of the test in the presence of the disease.

Ex Output:
2


Ex Input:
Question: Point out which of the following is a characteristic of childhood phobias: 
 Options:  <1> They can not be easily eliminated. <2> They are specific to a certain age. <3> They are short-lived. <4> They do not interfere with the child's daily life. <5> They are related to objectively dangerous stimuli.

Ex Output:
1


Ex Input:
Question: Substances that prevent abrupt changes in the pH of a solution by adding an acid or a base to it are called: 
 Options:  <1> Aceto-acetic bodies. <2> Tampons. <3> Hydrogens. <4> Anhydrous. <5> Answers 2 and 3 are the correct ones.

Ex Output:

2