39408
A number of Islamic writers and the 13th century Italian Marco Polo describe how this was obtained by sublimation from zinc ores and condensed onto clay or iron bars , archaeological examples of which have been identified at Kush in Iran .
 person: Marco Polo; location: Kush; location: Iran
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: Marco Polo, Kush, Iran 
Answer:
 person: Marco Polo; location: Kush; location: Iran