18616
The use of iron bells in sub-Saharan African music and the Niger–Congo area is linked to the early iron-making technology spread during the Bantu migrations .
 location: Niger–Congo
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: Niger–Congo 
Answer:
 location: Niger–Congo