Task: Question Answering
Input (English): Question: Ribosomes have three binding sites for the transfer RNAs (RNAs), which are: 
 Options:  <1> Site A of acetyl, P of propyl and E of ethyl. <2> A site of aminoacyl, P of peptidyl and E of exit (from English, exit). <3> A site of aminoacyl, peptidyl P and transferase T of the peptide. <4> Site A of previous, P of posterior and E of entry (of English, entry). <5> A site of aminoacyl, peptidyl P and terminating T.
Output (English): 2