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: Importin intervenes in the transport of proteins from the cytoplasm to:
Options: <0> Nucleus. <1> Endoplasmic reticulum. <2> Mitochondria. <3> Peroxisome <4> Lysosome
biology