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The " stamp seal " is a carved object , usually stone , first made in the 4th millennium BC , and probably earlier .
 time: 4th millennium BC
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: 4th millennium BC 
Answer:
 time: 4th millennium BC