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.

[EX Q]: Question: In the synthesis of DNA, the quinolones act: 
 Options:  <0> Joining the double helix and thus blocking the progress of the replication fork. <1> Interlacing in the double helix and thus causing errors in the transcription. <2> On DNA gyrase. <3> As nucleotide analogs that are incorporated into DNA. <4> About DNA polymerases.
[EX A]: biology

[EX Q]: Question: It has a recessive inheritance linked to the X chromosome the: 
 Options:  <0> Acatalasemia <1> Hemophilia A. <2> Rett syndrome. <3> Cystic fibrosis, <4> Hypophosphatemia
[EX A]: biology

[EX Q]: Question: To estimate the plasma clearance of a drug (CLIR) that presents a linear kinetic behavior and is excreted significantly in the urine, in a patient with renal failure (RI), it is necessary to know: 
 Options:  <0> Clearance of creatinine in the uremic patient (CLcrIR) and in individuals with normal renal function (CLcrFRN). <1> The renal clearance of the drug in patients with normal renal function (CLrFRN), CLcrIR and CLcrFRN. <2> The fraction of drug excreted in unaltered form in the urine (fr), the dose administered (D), CLrFRN, CLcrIR and CLcrFRN. <3> fr, CLcrIR and CLcrFRN and the plasma clearance of the drug in patients with normal renal function <4> fr, CLrFRN, CLcrIR, CLcrFRN and D.
[EX A]:
pharmacology