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.

Q: Question: The sensitivity of a diagnostic test is related to: 
 Options:  <0> Its ability to discriminate true positives. <1> Its ability to discriminate true negatives. <2> Its ability to discriminate against false positives. <3> Its ability to discriminate against false negatives. <4> The high cut point.

A: psychology
****
Q: Question: The oxygen of the ethers as that of the alcohols can be protonated to generate: 
 Options:  <0> Iminium ion. <1> Alkaloxonium ions. <2> Peroxides <3> Piranos. <4> Enaminas

A: chemistry
****
Q: Question: For the industrial production of tin, the ore is split: 
 Options:  <0> Cinnabar. <1> Blende. <2> Wurtzita <3> Casiterita. <4> Pyrite.

A:
chemistry
****