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 an electrochemical cell, the supporting electrolyte serves to: 
 Options:  <0> That the principle of electroneutrality in the dissolution is fulfilled. <1> That their ions are electrolized preferably in order to prevent the consumption of electroactive substance. <2> That in the cell there is transport by migration, in order to achieve greater sensitivity. <3> That the solution has an adequate electrical conductivity. <4> Encourage transport by diffusion of the electroactive substance.
[EX A]: chemistry

[EX Q]: Question: The non-selective medium commonly used for the growth of gonococcus (Neisseria gonorrhoeae) is: 
 Options:  <0> Chocolate agar. <1> Agar blood. <2> Mannitol saline agar. <3> Nutritious agar <4> MacConkey agar.
[EX A]: biology

[EX Q]: Question: How is it possible that during the replication of the bacterial DNA the guide (or forward) and delayed strands are synthesized in a coordinated way? 
 Options:  <0> The guide strand is synthesized in the 5'-3'direction and the delayed one in the 3'-5'direction. <1> The holoenzyme DNA Polymerase III contains two copies of the catalytic core of the enzyme. <2> Proteins bound to the delayed strand control the synthesis speed of the guide strand. <3> Specific enzymes control the opening of the replication fork. <4> The helicase controls the speed of synthesis in both strands.
[EX A]:
chemistry