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 reaction between a ketone and a Grignard reagent causes, after hydrolysing the salt formed, a: 
 Options:  <1> Carboxylic ester. <2> Alcohol. <3> Ether. <4> Aldehyde. <5> Carboxylic acid.
