Task: Text Categorization
Input (English): 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:  <0> Alanine, valine, glycine. <1> Tryptophan, tyrosine, phenylalanine. <2> Serine, methionine, asparagine. <3> Cysteine, alanine, methionine. <4> None of the above is correct, proteins never exhibit fluorescence.
Output (English): chemistry