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: A neutral gene mutation: 
 Options:  <1> Change a coding codon by another synonym without altering the amino acid sequence of the protein. <2> A coding codon changes with a different one and the protein is functionally different. <3> It generates a non-functional protein. <4> It changes the amino acid sequence of the protein without altering its function. <5> Suppresses the effect of a previous mutation.
