Detailed 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'.
Problem:Question: The clinical specificity of an analytical parameter (test), with respect to a certain pathology, 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.
Solution:
4