Task: Text Categorization
Input (English): Question: Regarding the phases of the clinical development of a drug, which of the following characteristics does NOT correspond to a clinical trial in phase 2? 
 Options:  <0> They are exploratory therapeutic studies. <1> They are performed in a large number of patients (between 100 and 1000). <2> They are used to delimit a range of therapeutic doses. <3> The informed consent of the patients is required for their inclusion in the study. <4> They are usually of short duration.
Output (English): medicine