Detailed Instructions: 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.
Problem:Question: Heterochromatin lacks:
Options: <0> Histone H1. <1> Nucleosomes <2> Exons <3> Transcriptional activity <4> Origins of replication.
Solution:
biology