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On 17 March 2014 it was announced that the BICEP2 instrument had detected the first type of B-modes , consistent with inflation and gravitational waves in the early universe at the level of , which is the amount of power present in gravitational waves compared to the amount of power present in other scalar density perturbations in the very early universe .
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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:  
Answer:
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