7369
Instances of carbon steel based on complex preheating principles were found to be in production around the 1st century AD in northwest Tanzania .
 location: Tanzania
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Tanzania 
Answer:
 location: Tanzania