Table:
text: Gold medalists at the BWF World Championships
Results
Results
Year_ Mens_singles Womens_singles Mens_doubles Womens_doubles Mixed_doubles
1995 Heryanto Arbi Ye Zhaoying Rexy Mainaky Ricky Subagja Gil Young-ah Jang Hye-ock Thomas Lund Marlene Thomsen
1993 Joko Suprianto Susi Susanti Ricky Subagja Rudy Gunawan Nong Qunhua Zhou Lei Thomas Lund Catrine Bengtsson
1991 Zhao Jianhua Tang Jiuhong Park Joo-bong Kim Moon-soo Guan Weizhen Nong Qunhua Park Joo-bong Chung Myung-hee
1989 Yang Yang Li Lingwei Li Yongbo Tian Bingyi Lin Ying Guan Weizhen Park Joo-bong Chung Myung-hee
1987 Yang Yang Han Aiping Li Yongbo Tian Bingyi Lin Ying Guan Weizhen Wang Pengren Shi Fangjing
1985 Han Jian Han Aiping Park Joo-bong Kim Moon-soo Han Aiping Li Lingwei Park Joo-bong Yoo Sang-hee

Question: Who played mixed doubles in the gold medalists at the 1991 BWF World Championships?