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 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.
[EX A]: pharmacology

[EX Q]: Question: In a potentiometry at zero intensity the electrode: 
 Options:  <0> Indicator always measures balance potentials. <1> Indicator measures the half-wave potential. <2> Indicator can measure a mixed potential. <3> Reference is always a calomel platinum electrode. <4> Indicator is always a platinum electrode.
[EX A]: chemistry

[EX Q]: Question: Botulinum toxin: 
 Options:  <0> It occurs in infected and poorly aerated wounds. <1> Blocks protein synthesis. <2> It blocks the secretion of acetylcholine in the myoneural plaque. <3> It interferes with nerve impulse transmission at the level of axons. <4> It causes necrosis of the nerve endings.
[EX A]:
biology