You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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: A distension is defined as: 
 Options:  <0> Soft tissue injury. <1> Forced movement of abrupt production. <2> Injury by stretching a muscle. <3> Injury of the joint capsule. <4> Interruption in the continuity of a bone.
Solution: nursery
Why? Distension means Bloating and swelling in the belly area. It does not have much to do with chemistry, psychology, pharmacology, biology and medicine. Hence, the correct topic is nursery.

New input: Question: RNA polymerases are characterized by: 
 Options:  <0> Begin RNA synthesis without the need for primers. <1> Synthesize RNA in the 3 '-> 5' direction. <2> A lower error rate than DNA polymerases. <3> Incorporate ribonucleotides without the need for a mold. <4> Enter T instead of U.
Solution:
biology