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: The Wittig reaction is one of the most important processes to obtain: 
 Options:  <1> Alquenos <2> Alcanes. <3> Ketones <4> Ethers <5> Nitriles
