TASK 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.
PROBLEM: Question: The tetracyclines act on the: 
 Options:  <0> DNA polymerase <1> Transpeptidation of the peptidoglycan in the wall. <2> RNA polymeres <3> 30S subunit of the ribosome. <4> DNA gyrase.

SOLUTION: biology

PROBLEM: Question: In suppression ion chromatography: 
 Options:  <0> A single column is used and the conductivity of the mobile phase is kept very low. <1> The eluent must be able to be removed selectively after separation and prior to the conductometric measurement. <2> The eluent incorporates a regenerating solution of strong acid flowing in the same direction as the mobile phase. <3> Weak exchangers are used from polystyrene polymers. <4> A mobile phase with ionic conductivity gradient is used.

SOLUTION: chemistry

PROBLEM: Question: In chronic bronchitis, it is characteristic: 
 Options:  <0> Destruction of alveolar walls. <1> Difficulty in the inspiratory flow. <2> Decrease in the volume of inspiratory reserve. <3> Elevation of capillary hydrostatic pressure. <4> Inflammation and mucosal hypersecretion of the respiratory tract.

SOLUTION:
pharmacology