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.
Q: Question: What is the role of the helicase in replication ?:
Options: <0> Join the single-stranded DNA to prevent the double helix from forming again. <1> Catalyze the union of nucleotides. <2> Correct the errors that occur in the replication. <3> Synthesize a primer to start replication. <4> Mechanically separate the strands of double-stranded DNA.
A:
chemistry