Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_28138035_27 (mens_singles VARCHAR, womens_doubles VARCHAR)
### Question:
Who is listed under mens singles when womens has wang nan zhang yining?
### Answer:
SELECT mens_singles FROM table_28138035_27 WHERE womens_doubles = "Wang Nan Zhang Yining"