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.

Input: Consider Input: Question: Esters can be obtained from carboxylic acids and alcohols, by applying the Fischer esterification reaction in which: 
 Options:  <0> A base is used as a catalyst. <1> A ketone is used as the solvent. <2> A reducing reagent is used. <3> An oxidizing agent is used. <4> Acid catalysis is used.

Output: pharmacology


Input: Consider Input: Question: The minimum amount of auditory stimulation needed to begin to identify the lyrics of a song is a threshold: 
 Options:  <0> Absolute. <1> Subliminal. <2> Differential. <3> Relative. <4> Musical.

Output: psychology


Input: Consider Input: Question: The synthesis of a human protein by a bacterium, to which human DNA has been introduced, demonstrates that: 
 Options:  <0> Evolution can be questioned. <1> Bacteria can acquire nucleus. <2> The genetic code is universal. <3> The human proteins are identical to the proteins of the bacteria. <4> The bacteria can be pathogenic.


Output: pharmacology