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.

Question: In the presence of a patient with suspected blistering pemphigoid, which of the following tests should we perform to confirm the diagnosis? 
 Options:  <0> Dermatoscopy. <1> Cultivation of the contents of a blister. <2> Skin biopsy for culture. <3> Skin biopsy for histological study and direct immunofluorescence. <4> Analytical with determination of antinuclear and anti DNA antibodies.
medicine

Question: Which of the following statements about the steady-state infusion of a drug is true? 
 Options:  <0> The concentration reached in steady state of equilibrium depends exclusively on the clearance. <1> The time necessary to reach the steady state of equilibrium depends on the volume of distribution. <2> The concentration reached in a steady state depends exclusively on the elimination half-life. <3> The concentration achieved in the steady state equilibrium depends on the clearance and the infusion rate. <4> The time required to reach the steady state of equilibrium depends on the clearance.
pharmacology

Question: The excitatory postsynaptic potentials: 
 Options:  <0> They are all or nothing. <1> They are hyperpolarizing. <2> They can be added. <3> They spread long distances. <4> They present a refractory period.

biology