Table:
text: 2008 Formula Nippon season
Calendar
Calendar
Round Circuit Date_ Pole_Position Fastest_Lap Winning_Driver Winning_Team
1 Fuji Speedway 6 April Tsugio Matsuda Yuji Tachikawa Tsugio Matsuda Team Impul
2 Suzuka Circuit 11 May Tsugio Matsuda Yuji Tachikawa Tsugio Matsuda Team Impul
3 Twin Ring Motegi 25 May Tsugio Matsuda Tsugio Matsuda Tsugio Matsuda Team Impul
4 Okayama International Circuit 8 June Tsugio Matsuda Satoshi Motoyama Loïc Duval Nakajima Racing
5 Suzuka Circuit 13 July Tsugio Matsuda Hiroaki Ishiura Tsugio Matsuda Team Impul
5 Suzuka Circuit 13 July Satoshi Motoyama Roberto Streit Kohei Hirate Team Impul
6 Twin Ring Motegi 10 August Tsugio Matsuda Roberto Streit Loïc Duval Nakajima Racing

Question: Who was the winning driver at the Okayama International Circuit for the 2008 Formula Nippon season calendar?