instruction:
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:
Question: The antibiotic tetracycline: 
 Options:  <0> It binds to the 30S subunit and inhibits the binding of aminoacyl-tRNA. <1> Inhibits the peptidyltransferase activity of the 50S ribosomal subunit. <2> It binds to the 50S ribosomal subunit and inhibits translocation. <3> It inhibits the initiation and originates an erroneous reading of the mRNA. <4> It causes premature termination by acting as an analog of the aminoacyl-tRNA.
answer:
pharmacology


question:
Question: As to the height of the plate (H) in a column chromatographic separation it can be said that: 
 Options:  <0> It is inversely proportional to the variance (standard deviation of the band). <1> It is directly proportional to the number of theoretical plates and inversely proportional to the length of the column. <2> It is directly proportional to the variance and inversely proportional to the distance traveled by the center of the band to the detector (L). <3> It is directly proportional to the variance and distance traveled by the center of the band to the detector (L). <4> It does not depend on the variance or the distance traveled by the center of the band.
answer:
pharmacology


question:
Question: The so-called poly-Ig receptor: 
 Options:  <0> Facilitates the transport of IgA through the mucosal epithelium. <1> Mediates the transport of IgG through the placenta. <2> Stabilizes the polymer structure of an IgM. <3> It is expressed on the surface of B lymphocytes. <4> It is expressed on the surface of tissue macrophages.
answer:

biology