63548
In May 1783 , he presented his findings to the Royal Society , suggesting that the periodic variability was caused by a dark body passing in front of the star ( or else that the star itself has a darker region that is periodically turned toward the Earth ) .
 organization: Royal Society
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: Royal Society 
Answer:
 organization: Royal Society