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 initial procedure of choice to investigate a possible obstruction of the biliary tract is: 
 Options:  <0> Hepatobiliary ultrasound. <1> Endoscopic retrograde cholangiopancreatography (ERCP). <2> Colangio Magnetic Resonance. <3> Computed tomography. Abdominal CT <4> Percutaneous transhepatic cholangiography.
[A]: medicine


[Q]: Question: The tube of very small diameter and about 6 meters in length that runs along the posterolateral side of the testicle and connects with the vas deferens, is it called? 
 Options:  <0> Prostate. <1> Epididymis <2> Urethra. <3> Epéndimo. <4> Seminiferous tubule.
[A]: pharmacology


[Q]: Question: In eukaryotes, the DNA polymerase β: 
 Options:  <0> It is a polymerase of family B. <1> It carries out the synthesis and repair of mitochondrial DNA. <2> Replicate DNA with injuries. <3> It is involved in the repair of nuclear DNA. <4> The synthesis of nuclear DNA begins.
[A]:
biology