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: In the compression process occurs: 
 Options:  <0> An aggregation of the powder to be compressed. <1> A decrease in porosity. <2> A decrease in interparticular contact. <3> An increase in porosity. <4> An unpacking of the particles.
pharmacology

Question: Indicate which of the following statements is true about bilirubin: 
 Options:  <0> It is a catabolic product of the heme group. <1> It is a product of the urea cycle. <2> It is an intermediary of the Krebs cycle. <3> It is a precursor of hepatic gluconeogenesis. <4> It is a product of cholesterol degradation.
chemistry

Question: What is the main cerebral structure involved in conditioned fear ?: 
 Options:  <0> The hippocampus <1> The cingulate cortex. <2> The olfactory bulb. <3> The hypothalamus <4> The amygdala

psychology