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Robert Trivers ' theory of parental investment predicts that the sex making the largest investment in lactation , nurturing and protecting offspring will be more discriminating in mating and that the sex that invests less in offspring will compete for access to the higher investing sex ( see Bateman 's principle ) .
 person: Robert Trivers; person: Bateman
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: Robert Trivers, Bateman 
Answer:
 person: Robert Trivers; person: Bateman