user: Question: Who is listed under mens singles when womens has Wang Nan Zhang Yining?
Columns: ['Year Location', 'Mens Singles', 'Womens Singles', 'Mens Doubles', 'Womens Doubles']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2012 Doha', 'Xu Xin', 'Chen Meng', 'Ma Lin Xu Xin', 'Li Xiaodan Wen Jia']
SQL:

assistant: SELECT "Mens Singles" FROM "Table" WHERE "Womens Doubles" = 'Wang Nan Zhang Yining';