Instructions: 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 proteins can exhibit a fluorescent emission spectrum due to the presence of the following intrinsic fluorophores that absorb radiation in the UV-next region:
Options: <1> Alanine, valine, glycine. <2> Tryptophan, tyrosine, phenylalanine. <3> Serine, methionine, asparagine. <4> Cysteine, alanine, methionine. <5> None of the above is correct, proteins never exhibit fluorescence.
Output:
2