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If you choose dialog options that open some backstories (IE Codex entries), then you get XP. Also, some dialog options are absolutely necessary to get the Historian Acheivement.
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The Roster
Grand Theft Auto IV|Dead Rising|Lost Planet|Saint's Row|Marvel: Ultimate Alliance|Rainbow Six: Vegas|Command and Conquer 3|Splinter Cell: Double Agent|Call Of Duty 3|Call Of Duty 4|Assassin's Creed|Mass Effect|Rainbow Six: Vegas 2|Frontlines: Fuel Of War|Scene It: LCA|Forza 2|Battlefield: Bad Company|Mercenaries 2: World In Flames|
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