user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: the beatmania append gottamix video game has what soundtrack? 
Knowledge Triplets: Beatmania Append Gottamix, cvg.computer_videogame.release_date, 1999-05-27
Vandal Hearts, base.wikipedia_infobox.video_game.developer, Konami Computer Entertainment Tokyo
beatmania GOTTAMIX Original Soundtrack, music.album.genre, Video game music
Beatmania Append Gottamix, cvg.video_game_soundtrack.video_game, beatmania GOTTAMIX Original Soundtrack
beatmania GOTTAMIX Original Soundtrack, music.album.album_content_type, Compilation album
Pro Evolution Soccer 3, base.wikipedia_infobox.video_game.developer, Konami Computer Entertainment Tokyo
Action game, cvg.cvg_genre.games, Beatmania Append Gottamix
Konami Computer Entertainment Tokyo, cvg.cvg_developer.games_developed, Beatmania Append Gottamix
Pro Evolution Soccer 2, base.wikipedia_infobox.video_game.developer, Konami Computer Entertainment Tokyo
beatmania GOTTAMIX Original Soundtrack, music.album.primary_release, beatmania GOTTAMIX Original Soundtrack
beatmania GOTTAMIX Original Soundtrack, music.album.releases, beatmania GOTTAMIX Original Soundtrack
beatmania GOTTAMIX Original Soundtrack, music.release.album, beatmania GOTTAMIX Original Soundtrack
Video game music, music.genre.albums, beatmania GOTTAMIX Original Soundtrack
Pro Evolution Soccer 2011, base.wikipedia_infobox.video_game.developer, Konami Computer Entertainment Tokyo
beatmania GOTTAMIX Original Soundtrack, cvg.video_game_soundtrack.video_game, Beatmania Append Gottamix
Beatmania Append Gottamix, cvg.computer_videogame.soundtracks, beatmania GOTTAMIX Original Soundtrack
Beatmania Append Gottamix, cvg.computer_videogame.cvg_genre, Action game
beatmania GOTTAMIX Original Soundtrack, music.album.album_content_type, Soundtrack
beatmania GOTTAMIX Original Soundtrack, music.album.release_type, Album
Beatmania Append Gottamix, cvg.computer_videogame.developer, Konami Computer Entertainment Tokyo

Answer: beatmania GOTTAMIX Original Soundtrack