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With some two million children involved in the farming of cocoa in West Africa , child slavery and trafficking were major concerns in 2018 .
 location: West 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: West Africa 
Answer:
 location: West Africa