23487
A customs official said the arrests followed a `` Snake Day '' at Utrecht University in the Netherlands , an event used by some collectors as an opportunity to obtain rare snakes .
 event: a `` Snake Day ''; organization: Utrecht University; geographical social political: Netherlands
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: a `` Snake Day '', Utrecht University, Netherlands 
Answer:
 event: a `` Snake Day ''; organization: Utrecht University; geographical social political: Netherlands