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 six-membered cyclic ether with an oxygen atom is called: 
 Options:  <1> Oxolane <2> Oxano <3> Dioxane <4> Oxirano. <5> Oxetano.
