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: The promoter region of a gene is:
Options: <1> The place of completion of the transcript. <2> The binding site of RNA polymerase during the initiation of mRNA synthesis. <3> The place of recognition to process primary transcripts. <4> A sequence located in the 5 'region of all mRNAs to initiate translation. <5> A sequence that is eliminated during RNA splicing.
Output:
2