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On April 16 of last year when Blair was visiting the US , they had some exchange between them .
 date: April 16 of last year; person: Blair; geographical social political: US
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities: April 16 of last year, Blair, US 
Answer:
 date: April 16 of last year; person: Blair; geographical social political: US