Task: Question Answering
Input (English): 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.
Output (English): 4