39576
In 1993 , he returned to Iran and started his academic and professional activities in Tehran .
 location: Iran; organization: Tehran
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: Iran, Tehran 
Answer:
 location: Iran; organization: Tehran