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: In relation to DNA replication, the term processivity indicates:
Options: <1> Error rate of the polymerase. <2> Deletion of one or more bases in the DNA. <3> Specificity in the speed of replication. <4> The ability of the enzyme to catalyze multiple consecutive reactions without detaching from the substrate. <5> 1,2 and 3.
Output:
4