Teacher: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'.
Teacher: Now, understand the problem? Solve this instance: Question: Apoptosis is:
Options: <1> The cellular senescence. <2> A form of programmed cell death. <3> Cell migration <4> A mode of cellular reprogramming. <5> The process of cell differentiation.
Student:
2