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In mathematics , the Gibbs measure , named after Josiah Willard Gibbs , is a probability measure frequently seen in many problems of probability theory and statistical mechanics .
 person: Gibbs; person: Josiah Willard Gibbs
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: Gibbs, Josiah Willard Gibbs 
Answer:
 person: Gibbs; person: Josiah Willard Gibbs