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On the Republican side , state Sen. Ileana Ros-Lehtinen concentrated on get-out-the-vote efforts Monday in hopes of winning a majority against opponents led by fellow Cuban-American Carlos Perez , a wealthy activist for conservative causes who was endorsed by former National Security Council aide Oliver North.
 Work for: Oliver North., National Security Council
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: Organization based in, Located in, Live in, Work for, Kill 
Text: {0} 
 Entity Pairs:  Oliver North., National Security Council 
Answer:
 Work for: Oliver North., National Security Council