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 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.
chemistry

Question: In studies that use meta-analysis for the systematic review of the results of psychotherapies, which is the most used dependent variable? : 
 Options:  <0> The number of depressive symptoms. <1> The size of the effect. <2> The systematized observation of the therapist. <3> The number of patients that has been cured. <4> The expectations of the patient.
psychology

Question: Of the following scales of pain assessment in childhood, which is recommended for school children aged 7 to 8 ?: 
 Options:  <0> NFCS scale. <1> Numerical or analog scale. <2> CHEOPS scale. <3> Scale Oucher. <4> Ladder of Wong and Baker.

nursery