91155
In the 20th century , Africa saw the biggest increase in its population due to lessening of the mortality rate in many countries due to peace , famine relief , medicine , and above all , the end or decline of the slave trade .
 location: Africa
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: Africa 
Answer:
 location: Africa