TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: medicine

PROBLEM: Question: The p53 factor induces: 
 Options:  <0> Survival. <1> Proliferation. <2> Senescence <3> Apoptosis <4> Increase.

SOLUTION: biology

PROBLEM: Question: In the technique of atomic absorption spectrometry, the use of an electrothermal atomizer instead of the flame provides: 
 Options:  <0> Greater accuracy <1> Greater precision. <2> Greater sample consumption <3> Longer analysis times. <4> Greater sensitivity

SOLUTION:
chemistry