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 Grignard reagents attack the epoxides to give, after the appropriate hydrolysis: 
 Options:  <1> Carboxylic acids. <2> Cyclic amides. <3> Open aliphatic chains. <4> Open-chain alcohols. <5> Cyclic ethers.
