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: A light-emitting diode: 
 Options:  <1> It is the same as a photovoltaic cell. <2> It is the inverse of a photovoltaic cell. <3> It is the same as a photovoltaic cell. <4> It is the inverse of a photovoltaic cell. <5> It is equivalent to a photochemical cell.
