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: Which of the following membranes would be more fluid: 
 Options:  <1> Lipid bilayer with polyunsaturated fatty acids of 18 carbon atoms. <2> Lipid bilayer with saturated fatty acids of 18 carbon atoms. <3> Lipid bilayer with saturated fatty acids of 16 carbon atoms. <4> Lipid bilayer with polyunsaturated fatty acids of 16 carbon atoms. <5> All are equivalent in terms of fluency.
