Given the task definition and input, reply with output. In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: Apoptosis is:
Options: <0> The cellular senescence. <1> A form of programmed cell death. <2> Cell migration <3> A mode of cellular reprogramming. <4> The process of cell differentiation.
chemistry