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 main method for the preparation of βceto esters is the reaction known as: 
 Options:  <1> Malonic synthesis <2> Acetoacetic synthesis. <3> Condensing of Claisen. <4> Perkin reaction. <5> Hofmann reaction.
