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.

[EX Q]: Question: In the synthesis of DNA, the quinolones act: 
 Options:  <0> Joining the double helix and thus blocking the progress of the replication fork. <1> Interlacing in the double helix and thus causing errors in the transcription. <2> On DNA gyrase. <3> As nucleotide analogs that are incorporated into DNA. <4> About DNA polymerases.
[EX A]: biology

[EX Q]: Question: In which of the following positions should a patient be placed to perform a gastroscopy? 
 Options:  <0> Right lateral decubitus. <1> Left lateral decubitus. <2> Supine decubitus <3> Trendelemburg. <4> Sims position.
[EX A]: nursery

[EX Q]: Question: The value of the admitted daily intake (ADI) of a food additive can be calculated from the following previously obtained data in animals: 
 Options:  <0> Level with no observed adverse effect (NOAEL). <1> Lower level with observed adverse effect (LOAEL). <2> Safety margin (MOS). <3> Toxic interval (IT). <4> Toxicity limit value (TLV).
[EX A]:
pharmacology