Definition: 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: Question: In chemiluminescent measurements, the analyte to be determined must first pass to the excited state by: 
 Options:  <1> Absorption of electromagnetic radiation. <2> Emission of electromagnetic radiation. <3> A chemical reaction <4> Radio waves. <5> Sound waves.
