Task: Text Categorization
Input (English): Question: The least effective prevention measure in the appearance of an outbreak of salmonellosis is: 
 Options:  <0> Active immunization to the population at risk. <1> Rigorous and frequent hand washing, as well as utensils and surfaces that will be used for cooking. <2> Keep food in the refrigerator. <3> Cook food with sufficient temperature (at least 70ºC). <4> Quick refrigeration of cooked foods.
Output (English): nursery