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 RNA Polymerase I of eukaryotes transcribes the genes of: 
 Options:  <1> The precursors of mRNAs. <2> The precursors of the TRANs. <3> The ribosomal RNAs 18S, 5,8S and 28S. <4> All precursors of cellular RNAs. <5> The catalytic RNAs.
Output:
3