81144
The duration of gestation in placental mammals ( i.e. mammals other than monotreme s and marsupial s ) varies from 18 days in jumping mice to 23 months in elephant s. Generally speaking , fetuses of larger land mammals require longer gestation periods .
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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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