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The Bronze Age was the period in human cultural development when the most advanced metalworking ( at least in systematic and widespread use ) included techniques for smelting copper and tin from naturally-occurring outcroppings of copper ores , and then combining those ores to cast bronze .
 time: Bronze Age
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: Bronze Age 
Answer:
 time: Bronze Age