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A logistic function , or related functions ( e.g. the Gompertz function ) are usually used in a descriptive or phenomenological manner because they fit well not only to the early exponential rise , but to the eventual levelling off of the pandemic as the population develops a herd immunity .
 person: Gompertz
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: Gompertz 
Answer:
 person: Gompertz