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He is best known for his work on ultraproduct s , in particular for " Łoś ' theorem " , which states that any first-order formula is true in an ultraproduct if and only if it is true in " most " factors ( see ultraproduct for details ) .
 person: Łoś
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: Łoś 
Answer:
 person: Łoś