Task: Text Categorization
Input (English): Question: In neurons once an action potential has started, a second action potential can not be triggered for a short period of time, regardless of the intensity of the stimulus applied. This period of time is known as: 
 Options:  <0> Synaptic delay. <1> Threshold depolarizing period. <2> Absolute refractory period. <3> Relative refractory period. <4> Spatial sumary.
Output (English): nursery