Task: Question Answering
Input (English): Question: When screening for a disease, aimed at high-risk groups, looking for disease in its initial stage, is called: 
 Options:  <1> Simple screening, non-selective, precocious. <2> Simple, selective, precocious screening. <3> Multiple, non-selective, late screening. <4> Multiple screening, selective, precocious. <5> Simple, selective, delayed screening.
Output (English): 2