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: An Au-Ag alloy: 
 Options:  <1> It is interstitial, and can occur in any composition. <2> It is substitutional, and can occur in any composition. <3> Gold and silver can not be alloyed. <4> A small amount of gold can be dissolved in silver, up to a limit of close to 10%, but not in a greater proportion. <5> A small amount of silver can be dissolved in the gold, up to a limit close to 10%, but not in a greater proportion.
