12012
North Korea offered to drop its nuclear and missile programs in exchange for security guarantees and economic aid , according to U . S . officials .
 North Korea, its, U . S, U . S . officials, nuclear, missile
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 North Korea, its, U . S, U . S . officials, nuclear, missile