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.

Example Input: 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
Example Output: medicine

Example Input: Question: A patient diagnosed with angina will NOT recommend: 
 Options:  <0> Alternating activity with periods of rest. <1> Take oral nitroglycerin in the morning. <2> Avoid extreme cold. <3> Follow a diet rich in fiber. <4> Leave the tobacco.
Example Output: nursery

Example Input: Question: Ferrous oxide, known as wustite (FeO) is non-stoichiometric because it contains: 
 Options:  <0> Excess iron <1> Oxygen excess <2> Iron defect. <3> Oxygen defect. <4> Defect of iron and oxygen.
Example Output:
chemistry