Task: Text Categorization
Input (English): Question: It has been proven that amphetamines have reinforcing effects because: 
 Options:  <0> They are GABAergic agonists. <1> They are dopaminergic antagonists. <2> They are serotonergic antagonists. <3> They are dopaminergic agonists. <4> They are serotonergic agonists.
Output (English): psychology