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In the second half of the century , the city was at the heart of the Scottish Enlightenment , when thinkers like David Hume , Adam Smith , James Hutton and Joseph Black were familiar figures in its streets .
 person: David Hume; person: Adam Smith; person: James Hutton; person: Joseph Black
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: David Hume, Adam Smith, James Hutton, Joseph Black 
Answer:
 person: David Hume; person: Adam Smith; person: James Hutton; person: Joseph Black