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.

Example Input: Question: Histone deacetylases (HDAC) promote:
Options: <0> A less condensed chromatin. <1> A weaker link between histones and DNA in nucleosomes. <2> The acetylation of lysine residues in histones. <3> That the poly (A) tail of the histone messenger RNAs be more extensive. <4> The termination of the transcription and the genetic silencing.
Example Output: pharmacology

Example Input: Question: Thiamine pyrophosphate (PPT) is not coenzyme of:
Options: <0> Pyruvate dehydrogenase (synthesis of acetyl CoA). <1> Alpha-ketoglutarate dehydrogenase (citric acid cycle). <2> Transketolase (pentose phosphate pathway). <3> Transaldolase (pentose phosphate route). <4> Pyruvate decarboxylase (ethanolic fermentation).
Example Output: pharmacology

Example Input: Question: If the guanine percentage of a double-stranded DNA molecule is 30%, that of adenine is:
Options: <0> 10% <1> 70% <2> 80% <3> twenty%. <4> 30%
Example Output:
biology