318350
Ibn Yazdad likewise chose a career in the civil service and became a government secretary ( katib ) , working under the caliphs in Samarra .
 location: Samarra
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: Samarra 
Answer:
 location: Samarra