27492
Prehistory The earliest evidence of habitation in the Ilkley area is flint arrowheads or microliths , dating to the Mesolithic period , from about 11,000 BC onwards .
 location: Ilkley
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ilkley 
Answer:
 location: Ilkley