Definition: 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.
Input: Question: The genome of the hepatitis B virus is DNA from: 
 Options:  <0> Simple string (+). <1> Simple string (-). <2> Double circular chain. <3> Double linear chain. <4> Incomplete circular double chain (with notches).
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
biology