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: A study is carried out to investigate the association between factor X and disease Z. To do this, 120 subjects with the disease and 420 controls (without the disease) are matched by age and sex. In both groups it is found that 20 subjects were exposed to factor X. What is the odds ratio (OR) between factor X and disease Z?
Options: <0> OR = 1 (no association). <1> OR = 2. <2> OR = 4 <3> OR = 6 <4> OR = 8
medicine

Question: A spontaneous process is characterized because:
Options: <0> In isolated systems the entropy decreases (S <0). <1> At constant pressure and temperature, the Gibbs energy decreases (G <0). <2> At constant pressure and temperature, the Helmholtz energy decreases (A <0). <3> At constant volume and temperature, the Gibbs energy increases (G> 0). <4> It is reversible.
pharmacology

Question: From among the following, indicate the most toxic substance according to the 50 lethal dose value:
Options: <0> Strychnine. <1> Nicotine. <2> Morphine. <3> Botulinum toxin. <4> Curare.
pharmacology